51515506636 has 24 divisors (see below), whose sum is σ = 99732971520. Its totient is φ = 23086333200.

The previous prime is 51515506633. The next prime is 51515506687. The reversal of 51515506636 is 63660551515.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51515506592 and 51515506601.

It is not an unprimeable number, because it can be changed into a prime (51515506633) 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, 8241996 + ... + 8248243.

It is an arithmetic number, because the mean of its divisors is an integer number (4155540480).

Almost surely, 2^51515506636 is an apocalyptic number.

It is an amenable number.

51515506636 is a deficient number, since it is larger than the sum of its proper divisors (48217464884).

51515506636 is a wasteful number, since it uses less digits than its factorization.

51515506636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16490325 (or 16490323 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 51515506636 in words is "fifty-one billion, five hundred fifteen million, five hundred six thousand, six hundred thirty-six".