66512657135530 has 16 divisors (see below), whose sum is σ = 121981703275944. Its totient is φ = 26103080536000.

The previous prime is 66512657135503. The next prime is 66512657135531. The reversal of 66512657135530 is 3553175621566.

It can be written as a sum of positive squares in 4 ways, for example, as 65920937727241 + 591719408289 = 8119171^2 + 769233^2 .

It is not an unprimeable number, because it can be changed into a prime (66512657135531) 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, 62747789221 + ... + 62747790280.

Almost surely, 2^{66512657135530} is an apocalyptic number.

66512657135530 is a deficient number, since it is larger than the sum of its proper divisors (55469046140414).

66512657135530 is a wasteful number, since it uses less digits than its factorization.

66512657135530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125495579561.

The product of its (nonzero) digits is 17010000, while the sum is 55.

The spelling of 66512657135530 in words is "sixty-six trillion, five hundred twelve billion, six hundred fifty-seven million, one hundred thirty-five thousand, five hundred thirty".