642534258215 has 16 divisors (see below), whose sum is σ = 780665558400. Its totient is φ = 507616422432.

The previous prime is 642534258187. The next prime is 642534258227. The reversal of 642534258215 is 512852435246.

It is a cyclic number.

It is not a de Polignac number, because 642534258215 - 2³⁰ = 641460516391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642534258215.

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, 639716 + ... + 1301654.

It is an arithmetic number, because the mean of its divisors is an integer number (48791597400).

Almost surely, 2^642534258215 is an apocalyptic number.

642534258215 is a deficient number, since it is larger than the sum of its proper divisors (138131300185).

642534258215 is a wasteful number, since it uses less digits than its factorization.

642534258215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664366.

The product of its digits is 2304000, while the sum is 47.

The spelling of 642534258215 in words is "six hundred forty-two billion, five hundred thirty-four million, two hundred fifty-eight thousand, two hundred fifteen".