51544430380681 has 16 divisors (see below), whose sum is σ = 60035894648064. Its totient is φ = 43335418112064.

The previous prime is 51544430380679. The next prime is 51544430380691. The reversal of 51544430380681 is 18608303444515.

It is a cyclic number.

It is not a de Polignac number, because 51544430380681 - 2¹ = 51544430380679 is a prime.

It is a super-2 number, since 2×51544430380681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51544430380601) 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, 17750725 + ... + 20449378.

It is an arithmetic number, because the mean of its divisors is an integer number (3752243415504).

Almost surely, 2^{51544430380681} is an apocalyptic number.

It is an amenable number.

51544430380681 is a deficient number, since it is larger than the sum of its proper divisors (8491464267383).

51544430380681 is a wasteful number, since it uses less digits than its factorization.

51544430380681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38203800.

The product of its (nonzero) digits is 5529600, while the sum is 52.

The spelling of 51544430380681 in words is "fifty-one trillion, five hundred forty-four billion, four hundred thirty million, three hundred eighty thousand, six hundred eighty-one".