2155200500 has 48 divisors (see below), whose sum is σ = 4983857424. Its totient is φ = 811366400.

The previous prime is 2155200499. The next prime is 2155200503. The reversal of 2155200500 is 50025512.

It can be written as a sum of positive squares in 8 ways, for example, as 216031204 + 1939169296 = 14698^2 + 44036^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155200503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118277 + ... + 135276.

It is an arithmetic number, because the mean of its divisors is an integer number (103830363).

Almost surely, 2^2155200500 is an apocalyptic number.

2155200500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155200500 is an abundant number, since it is smaller than the sum of its proper divisors (2828656924).

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

2155200500 is a wasteful number, since it uses less digits than its factorization.

2155200500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253589 (or 253577 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 2155200500 is about 46424.1370409833. The cubic root of 2155200500 is about 1291.7026772247.

The spelling of 2155200500 in words is "two billion, one hundred fifty-five million, two hundred thousand, five hundred".