51352721668304 has 80 divisors (see below), whose sum is σ = 116511756686976. Its totient is φ = 21466221004800.

The previous prime is 51352721668301. The next prime is 51352721668319. The reversal of 51352721668304 is 40386612725315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51352721668301) 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, 17251499 + ... + 20007989.

Almost surely, 2^{51352721668304} 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 51352721668304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58255878343488).

51352721668304 is an abundant number, since it is smaller than the sum of its proper divisors (65159035018672).

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

51352721668304 is a wasteful number, since it uses less digits than its factorization.

51352721668304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760604 (or 2760598 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 53.

The spelling of 51352721668304 in words is "fifty-one trillion, three hundred fifty-two billion, seven hundred twenty-one million, six hundred sixty-eight thousand, three hundred four".