66570651631 has 8 divisors (see below), whose sum is σ = 72890512128. Its totient is φ = 60295455000.

The previous prime is 66570651601. The next prime is 66570651647. The reversal of 66570651631 is 13615607566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66570651631 - 2⁵ = 66570651599 is a prime.

It is a super-2 number, since 2×66570651631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66570651601) 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, 11162845 + ... + 11168806.

It is an arithmetic number, because the mean of its divisors is an integer number (9111314016).

Almost surely, 2^66570651631 is an apocalyptic number.

66570651631 is a deficient number, since it is larger than the sum of its proper divisors (6319860497).

66570651631 is a wasteful number, since it uses less digits than its factorization.

66570651631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22331933.

The product of its (nonzero) digits is 680400, while the sum is 46.

It can be divided in two parts, 66570 and 651631, that added together give a triangular number (718201 = T₁₁₉₈).

The spelling of 66570651631 in words is "sixty-six billion, five hundred seventy million, six hundred fifty-one thousand, six hundred thirty-one".