642509995534 has 32 divisors (see below), whose sum is σ = 1059464074752. Its totient is φ = 289806072000.

The previous prime is 642509995471. The next prime is 642509995549. The reversal of 642509995534 is 435599905246.

It is a super-2 number, since 2×642509995534² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8010489 + ... + 8090299.

It is an arithmetic number, because the mean of its divisors is an integer number (33108252336).

Almost surely, 2^642509995534 is an apocalyptic number.

642509995534 is a deficient number, since it is larger than the sum of its proper divisors (416954079218).

642509995534 is a wasteful number, since it uses less digits than its factorization.

642509995534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82632.

The product of its (nonzero) digits is 52488000, while the sum is 61.

The spelling of 642509995534 in words is "six hundred forty-two billion, five hundred nine million, nine hundred ninety-five thousand, five hundred thirty-four".