51261216216 has 32 divisors (see below), whose sum is σ = 146460618240. Its totient is φ = 14646061728.

The previous prime is 51261216199. The next prime is 51261216289. The reversal of 51261216216 is 61261216215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152562976 + ... + 152563311.

It is an arithmetic number, because the mean of its divisors is an integer number (4576894320).

Almost surely, 2^51261216216 is an apocalyptic number.

51261216216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51261216216 is an abundant number, since it is smaller than the sum of its proper divisors (95199402024).

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

51261216216 is a wasteful number, since it uses less digits than its factorization.

51261216216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305126303 (or 305126299 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

Subtracting 51261216216 from its reverse (61261216215), we obtain a palindrome (9999999999).

The spelling of 51261216216 in words is "fifty-one billion, two hundred sixty-one million, two hundred sixteen thousand, two hundred sixteen".