642087398664 has 48 divisors (see below), whose sum is σ = 1739202947820. Its totient is φ = 214002518400.

The previous prime is 642087398663. The next prime is 642087398767. The reversal of 642087398664 is 466893780246.

642087398664 is a `hidden beast` number, since 6 + 420 + 8 + 73 + 9 + 86 + 64 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 416357886564 + 225729512100 = 645258^2 + 475110^2 .

It is not an unprimeable number, because it can be changed into a prime (642087398663) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 32854 + ... + 1133690.

Almost surely, 2^642087398664 is an apocalyptic number.

It is an amenable number.

642087398664 is an abundant number, since it is smaller than the sum of its proper divisors (1097115549156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642087398664 is a wasteful number, since it uses less digits than its factorization.

642087398664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108950 (or 1108943 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 63.

The spelling of 642087398664 in words is "six hundred forty-two billion, eighty-seven million, three hundred ninety-eight thousand, six hundred sixty-four".