51657772943680 has 56 divisors (see below), whose sum is σ = 123010741186560. Its totient is φ = 20662996738560.

The previous prime is 51657772943677. The next prime is 51657772943681. The reversal of 51657772943680 is 8634927775615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657772943681) 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, 83464801 + ... + 84081439.

It is a 1-persistent number, because it is pandigital, but 2⋅51657772943680 = 103315545887360 is not.

Almost surely, 2^{51657772943680} is an apocalyptic number.

It is an amenable number.

51657772943680 is an abundant number, since it is smaller than the sum of its proper divisors (71352968242880).

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

51657772943680 is a wasteful number, since it uses less digits than its factorization.

51657772943680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878447 (or 878437 counting only the distinct ones).

The product of its (nonzero) digits is 533433600, while the sum is 70.

The spelling of 51657772943680 in words is "fifty-one trillion, six hundred fifty-seven billion, seven hundred seventy-two million, nine hundred forty-three thousand, six hundred eighty".