66640874272 has 48 divisors (see below), whose sum is σ = 150718966272. Its totient is φ = 28412375040.

The previous prime is 66640874269. The next prime is 66640874299. The reversal of 66640874272 is 27247804666.

It is a happy number.

It is a super-2 number, since 2×66640874272² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727504 + ... + 813967.

It is an arithmetic number, because the mean of its divisors is an integer number (3139978464).

Almost surely, 2^66640874272 is an apocalyptic number.

It is an amenable number.

66640874272 is an abundant number, since it is smaller than the sum of its proper divisors (84078092000).

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

66640874272 is a wasteful number, since it uses less digits than its factorization.

66640874272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541681 (or 1541673 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 52.

The spelling of 66640874272 in words is "sixty-six billion, six hundred forty million, eight hundred seventy-four thousand, two hundred seventy-two".