642786746031 has 18 divisors (see below), whose sum is σ = 940371377400. Its totient is φ = 423100099656.

The previous prime is 642786745987. The next prime is 642786746039. The reversal of 642786746031 is 130647687246.

642786746031 is a `hidden beast` number, since 6 + 4 + 27 + 8 + 6 + 7 + 4 + 603 + 1 = 666.

It is not a de Polignac number, because 642786746031 - 2⁹ = 642786745519 is a prime.

It is a super-2 number, since 2×642786746031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642786746039) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5665731 + ... + 5778068.

It is an arithmetic number, because the mean of its divisors is an integer number (52242854300).

Almost surely, 2^642786746031 is an apocalyptic number.

642786746031 is a deficient number, since it is larger than the sum of its proper divisors (297584631369).

642786746031 is a wasteful number, since it uses less digits than its factorization.

642786746031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11443963 (or 11443881 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 642786746031 in words is "six hundred forty-two billion, seven hundred eighty-six million, seven hundred forty-six thousand, thirty-one".