66523477631 has 16 divisors (see below), whose sum is σ = 76035109248. Its totient is φ = 57656793600.

The previous prime is 66523477589. The next prime is 66523477637. The reversal of 66523477631 is 13677432566.

It is a cyclic number.

It is not a de Polignac number, because 66523477631 - 2³⁰ = 65449735807 is a prime.

It is a super-2 number, since 2×66523477631² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66523477631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66523477637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264455 + ... + 450536.

It is an arithmetic number, because the mean of its divisors is an integer number (4752194328).

Almost surely, 2^66523477631 is an apocalyptic number.

66523477631 is a deficient number, since it is larger than the sum of its proper divisors (9511631617).

66523477631 is a wasteful number, since it uses less digits than its factorization.

66523477631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715442.

The product of its digits is 3810240, while the sum is 50.

The spelling of 66523477631 in words is "sixty-six billion, five hundred twenty-three million, four hundred seventy-seven thousand, six hundred thirty-one".