2166026544 has 120 divisors (see below), whose sum is σ = 6826420224. Its totient is φ = 635184000.

The previous prime is 2166026539. The next prime is 2166026549. The reversal of 2166026544 is 4456206612.

2166026544 is a `hidden beast` number, since 2 + 1 + 6 + 602 + 6 + 5 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (2166026539) and next prime (2166026549).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2166026499 and 2166026508.

It is not an unprimeable number, because it can be changed into a prime (2166026549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27049 + ... + 71159.

Almost surely, 2^2166026544 is an apocalyptic number.

2166026544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166026544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3413210112).

2166026544 is an abundant number, since it is smaller than the sum of its proper divisors (4660393680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166026544 is a wasteful number, since it uses less digits than its factorization.

2166026544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44167 (or 44158 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 2166026544 is about 46540.5902841810. The cubic root of 2166026544 is about 1293.8619009560.

The spelling of 2166026544 in words is "two billion, one hundred sixty-six million, twenty-six thousand, five hundred forty-four".