642906236026908 has 144 divisors (see below), whose sum is σ = 1927133607759360. Its totient is φ = 176817632745600.

The previous prime is 642906236026889. The next prime is 642906236026931. The reversal of 642906236026908 is 809620632609246.

642906236026908 is a `hidden beast` number, since 6 + 4 + 2 + 9 + 0 + 6 + 2 + 360 + 269 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 130470688 + ... + 135308583.

Almost surely, 2^{642906236026908} is an apocalyptic number.

It is an amenable number.

642906236026908 is an abundant number, since it is smaller than the sum of its proper divisors (1284227371732452).

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

642906236026908 is a wasteful number, since it uses less digits than its factorization.

642906236026908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265779648 (or 265779643 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 63.

The spelling of 642906236026908 in words is "six hundred forty-two trillion, nine hundred six billion, two hundred thirty-six million, twenty-six thousand, nine hundred eight".