51136990540 has 24 divisors (see below), whose sum is σ = 110851800192. Its totient is φ = 19794963840.

The previous prime is 51136990523. The next prime is 51136990543. The reversal of 51136990540 is 4509963115.

It is a super-2 number, since 2×51136990540² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51136990543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41238889 + ... + 41240128.

It is an arithmetic number, because the mean of its divisors is an integer number (4618825008).

Almost surely, 2^51136990540 is an apocalyptic number.

It is an amenable number.

51136990540 is an abundant number, since it is smaller than the sum of its proper divisors (59714809652).

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

51136990540 is a wasteful number, since it uses less digits than its factorization.

51136990540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82479057 (or 82479055 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 43.

The spelling of 51136990540 in words is "fifty-one billion, one hundred thirty-six million, nine hundred ninety thousand, five hundred forty".