51216701368 has 64 divisors (see below), whose sum is σ = 111906385920. Its totient is φ = 21519388800.

The previous prime is 51216701357. The next prime is 51216701383. The reversal of 51216701368 is 86310761215.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51216701368.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4360063 + ... + 4371793.

It is an arithmetic number, because the mean of its divisors is an integer number (1748537280).

Almost surely, 2^51216701368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51216701368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55953192960).

51216701368 is an abundant number, since it is smaller than the sum of its proper divisors (60689684552).

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

51216701368 is a wasteful number, since it uses less digits than its factorization.

51216701368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13268 (or 13264 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 51216701368 in words is "fifty-one billion, two hundred sixteen million, seven hundred one thousand, three hundred sixty-eight".