64666262631 has 16 divisors (see below), whose sum is σ = 86487223680. Its totient is φ = 42978185760.

The previous prime is 64666262587. The next prime is 64666262641. The reversal of 64666262631 is 13626266646.

It is not a de Polignac number, because 64666262631 - 2⁷ = 64666262503 is a prime.

It is a super-2 number, since 2×64666262631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64666262641) 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, 2473876 + ... + 2499878.

It is an arithmetic number, because the mean of its divisors is an integer number (5405451480).

Almost surely, 2^64666262631 is an apocalyptic number.

64666262631 is a deficient number, since it is larger than the sum of its proper divisors (21820961049).

64666262631 is a wasteful number, since it uses less digits than its factorization.

64666262631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28526.

The product of its digits is 2239488, while the sum is 48.

The spelling of 64666262631 in words is "sixty-four billion, six hundred sixty-six million, two hundred sixty-two thousand, six hundred thirty-one".