66553494 has 16 divisors (see below), whose sum is σ = 152122368. Its totient is φ = 19015272.

The previous prime is 66553493. The next prime is 66553499. The reversal of 66553494 is 49435566.

It is a super-3 number, since 3×66553494³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1584607 = 66553494 / (6 + 6 + 5 + 5 + 3 + 4 + 9 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66553493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792262 + ... + 792345.

It is an arithmetic number, because the mean of its divisors is an integer number (9507648).

Almost surely, 2^66553494 is an apocalyptic number.

66553494 is an abundant number, since it is smaller than the sum of its proper divisors (85568874).

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

66553494 is a wasteful number, since it uses less digits than its factorization.

66553494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584619.

The product of its digits is 388800, while the sum is 42.

The square root of 66553494 is about 8158.0324833872. The cubic root of 66553494 is about 405.2505567407.

The spelling of 66553494 in words is "sixty-six million, five hundred fifty-three thousand, four hundred ninety-four".