66389574690 has 24 divisors (see below), whose sum is σ = 172612894428. Its totient is φ = 17703886560.

The previous prime is 66389574661. The next prime is 66389574707. The reversal of 66389574690 is 9647598366.

It can be written as a sum of positive squares in 2 ways, for example, as 65587722201 + 801852489 = 256101^2 + 28317^2 .

It is a super-2 number, since 2×66389574690² (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 11 ways as a sum of consecutive naturals, for example, 368830881 + ... + 368831060.

Almost surely, 2^66389574690 is an apocalyptic number.

66389574690 is an abundant number, since it is smaller than the sum of its proper divisors (106223319738).

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

66389574690 is a wasteful number, since it uses less digits than its factorization.

66389574690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737661954 (or 737661951 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 63.

The spelling of 66389574690 in words is "sixty-six billion, three hundred eighty-nine million, five hundred seventy-four thousand, six hundred ninety".