66504774100 has 36 divisors (see below), whose sum is σ = 144391688028. Its totient is φ = 26587840000.

The previous prime is 66504774041. The next prime is 66504774107. The reversal of 66504774100 is 147740566.

It can be written as a sum of positive squares in 6 ways, for example, as 14650197444 + 51854576656 = 121038^2 + 227716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66504774107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15180 + ... + 365020.

It is an arithmetic number, because the mean of its divisors is an integer number (4010880223).

Almost surely, 2^66504774100 is an apocalyptic number.

It is an amenable number.

66504774100 is an abundant number, since it is smaller than the sum of its proper divisors (77886913928).

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

66504774100 is a wasteful number, since it uses less digits than its factorization.

66504774100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351756 (or 351749 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 66504774100 in words is "sixty-six billion, five hundred four million, seven hundred seventy-four thousand, one hundred".