51515115044 has 48 divisors (see below), whose sum is σ = 92202190080. Its totient is φ = 25179638400.

The previous prime is 51515115031. The next prime is 51515115049. The reversal of 51515115044 is 44051151515.

51515115044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51515115044.

It is not an unprimeable number, because it can be changed into a prime (51515115049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15519617 + ... + 15522935.

It is an arithmetic number, because the mean of its divisors is an integer number (1920878960).

Almost surely, 2^51515115044 is an apocalyptic number.

It is an amenable number.

51515115044 is a deficient number, since it is larger than the sum of its proper divisors (40687075036).

51515115044 is a wasteful number, since it uses less digits than its factorization.

51515115044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3900 (or 3898 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 32.

Adding to 51515115044 its reverse (44051151515), we get a palindrome (95566266559).

The spelling of 51515115044 in words is "fifty-one billion, five hundred fifteen million, one hundred fifteen thousand, forty-four".