66936013864 has 32 divisors (see below), whose sum is σ = 128934729000. Its totient is φ = 32558100480.

The previous prime is 66936013841. The next prime is 66936013867. The reversal of 66936013864 is 46831063966.

It can be written as a sum of positive squares in 4 ways, for example, as 59077191364 + 7858822500 = 243058^2 + 88650^2 .

It is not an unprimeable number, because it can be changed into a prime (66936013867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177897 + ... + 406840.

Almost surely, 2^66936013864 is an apocalyptic number.

It is an amenable number.

66936013864 is a deficient number, since it is larger than the sum of its proper divisors (61998715136).

66936013864 is a wasteful number, since it uses less digits than its factorization.

66936013864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585133 (or 585129 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 52.

The spelling of 66936013864 in words is "sixty-six billion, nine hundred thirty-six million, thirteen thousand, eight hundred sixty-four".