66204156 has 12 divisors (see below), whose sum is σ = 154476392. Its totient is φ = 22068048.

The previous prime is 66204139. The next prime is 66204157. The reversal of 66204156 is 65140266.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66204157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2758495 + ... + 2758518.

Almost surely, 2^66204156 is an apocalyptic number.

It is an amenable number.

66204156 is an abundant number, since it is smaller than the sum of its proper divisors (88272236).

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

66204156 is a wasteful number, since it uses less digits than its factorization.

66204156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5517020 (or 5517018 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 66204156 is about 8136.5936361600. The cubic root of 66204156 is about 404.5402617399.

The spelling of 66204156 in words is "sixty-six million, two hundred four thousand, one hundred fifty-six".