51515551652 has 12 divisors (see below), whose sum is σ = 90156667440. Its totient is φ = 25756503816.

The previous prime is 51515551643. The next prime is 51515551679. The reversal of 51515551652 is 25615551515.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223778 + ... + 391289.

It is an arithmetic number, because the mean of its divisors is an integer number (7513055620).

Almost surely, 2^51515551652 is an apocalyptic number.

It is an amenable number.

51515551652 is a deficient number, since it is larger than the sum of its proper divisors (38641115788).

51515551652 is a wasteful number, since it uses less digits than its factorization.

51515551652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636010 (or 636008 counting only the distinct ones).

The product of its digits is 187500, while the sum is 41.

The spelling of 51515551652 in words is "fifty-one billion, five hundred fifteen million, five hundred fifty-one thousand, six hundred fifty-two".