66601947204 has 36 divisors (see below), whose sum is σ = 181305301996. Its totient is φ = 20492906688.

The previous prime is 66601947197. The next prime is 66601947239. The reversal of 66601947204 is 40274910666.

It can be written as a sum of positive squares in 2 ways, for example, as 10526760000 + 56075187204 = 102600^2 + 236802^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66601947204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71155459 + ... + 71156394.

Almost surely, 2^66601947204 is an apocalyptic number.

It is an amenable number.

66601947204 is an abundant number, since it is smaller than the sum of its proper divisors (114703354792).

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

66601947204 is a wasteful number, since it uses less digits than its factorization.

66601947204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142311876 (or 142311871 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 66601947204 in words is "sixty-six billion, six hundred one million, nine hundred forty-seven thousand, two hundred four".