646031138523 has 16 divisors (see below), whose sum is σ = 866010700800. Its totient is φ = 428373800960.

The previous prime is 646031138521. The next prime is 646031138527. The reversal of 646031138523 is 325831130646.

646031138523 is an astonishing number since 646031138523 = 64603 + ... + 1138523.

It is not a de Polignac number, because 646031138523 - 2¹ = 646031138521 is a prime.

It is a super-2 number, since 2×646031138523² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646031138521) 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, 64603 + ... + 1138523.

It is an arithmetic number, because the mean of its divisors is an integer number (54125668800).

Almost surely, 2^646031138523 is an apocalyptic number.

646031138523 is a deficient number, since it is larger than the sum of its proper divisors (219979562277).

646031138523 is a wasteful number, since it uses less digits than its factorization.

646031138523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075002.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 646031138523 in words is "six hundred forty-six billion, thirty-one million, one hundred thirty-eight thousand, five hundred twenty-three".