51218940008 has 32 divisors (see below), whose sum is σ = 101724222600. Its totient is φ = 24093652992.

The previous prime is 51218939971. The next prime is 51218940023. The reversal of 51218940008 is 80004981215.

It can be written as a sum of positive squares in 4 ways, for example, as 51183632644 + 35307364 = 226238^2 + 5942^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283958 + ... + 427866.

Almost surely, 2^51218940008 is an apocalyptic number.

It is an amenable number.

51218940008 is a deficient number, since it is larger than the sum of its proper divisors (50505282592).

51218940008 is a wasteful number, since it uses less digits than its factorization.

51218940008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146549 (or 146545 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 51218940008 in words is "fifty-one billion, two hundred eighteen million, nine hundred forty thousand, eight".