642131510512 has 40 divisors (see below), whose sum is σ = 1248157112832. Its totient is φ = 320026872000.

The previous prime is 642131510479. The next prime is 642131510513. The reversal of 642131510512 is 215015131246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642131510513) 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, 32014887 + ... + 32034937.

Almost surely, 2^642131510512 is an apocalyptic number.

It is an amenable number.

642131510512 is a deficient number, since it is larger than the sum of its proper divisors (606025602320).

642131510512 is a wasteful number, since it uses less digits than its factorization.

642131510512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26437 (or 26431 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 642131510512 its reverse (215015131246), we get a palindrome (857146641758).

The spelling of 642131510512 in words is "six hundred forty-two billion, one hundred thirty-one million, five hundred ten thousand, five hundred twelve".