51135451640 has 128 divisors (see below), whose sum is σ = 149059008000. Its totient is φ = 15331742208.

The previous prime is 51135451639. The next prime is 51135451667. The reversal of 51135451640 is 4615453115.

It is a super-2 number, since 2×51135451640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 51135451640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300530 + ... + 438849.

It is an arithmetic number, because the mean of its divisors is an integer number (1164523500).

Almost surely, 2^51135451640 is an apocalyptic number.

It is an amenable number.

51135451640 is an abundant number, since it is smaller than the sum of its proper divisors (97923556360).

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

51135451640 is a wasteful number, since it uses less digits than its factorization.

51135451640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739429 (or 739425 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 51135451640 in words is "fifty-one billion, one hundred thirty-five million, four hundred fifty-one thousand, six hundred forty".