51115540436 has 24 divisors (see below), whose sum is σ = 89594518440. Its totient is φ = 25517140992.

The previous prime is 51115540397. The next prime is 51115540453. The reversal of 51115540436 is 63404551115.

It can be written as a sum of positive squares in 4 ways, for example, as 120868036 + 50994672400 = 10994^2 + 225820^2 .

It is a super-2 number, since 2×51115540436² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51115540396 and 51115540405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9994616 + ... + 9999728.

It is an arithmetic number, because the mean of its divisors is an integer number (3733104935).

Almost surely, 2^51115540436 is an apocalyptic number.

It is an amenable number.

51115540436 is a deficient number, since it is larger than the sum of its proper divisors (38478978004).

51115540436 is a wasteful number, since it uses less digits than its factorization.

51115540436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8603 (or 8601 counting only the distinct ones).

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

The spelling of 51115540436 in words is "fifty-one billion, one hundred fifteen million, five hundred forty thousand, four hundred thirty-six".