51213958140 has 24 divisors (see below), whose sum is σ = 143399082960. Its totient is φ = 13657055488.

The previous prime is 51213958127. The next prime is 51213958163. The reversal of 51213958140 is 4185931215.

It is a congruent number.

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, 426782925 + ... + 426783044.

It is an arithmetic number, because the mean of its divisors is an integer number (5974961790).

Almost surely, 2^51213958140 is an apocalyptic number.

It is an amenable number.

51213958140 is an abundant number, since it is smaller than the sum of its proper divisors (92185124820).

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

51213958140 is a wasteful number, since it uses less digits than its factorization.

51213958140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853565981 (or 853565979 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 51213958140 in words is "fifty-one billion, two hundred thirteen million, nine hundred fifty-eight thousand, one hundred forty".