51504171521881 has 16 divisors (see below), whose sum is σ = 55597757071360. Its totient is φ = 47429534940480.

The previous prime is 51504171521827. The next prime is 51504171521977. The reversal of 51504171521881 is 18812517140515.

It is a cyclic number.

It is not a de Polignac number, because 51504171521881 - 2⁷ = 51504171521753 is a prime.

It is a super-2 number, since 2×51504171521881² (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 (51504171521821) 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, 6716200 + ... + 12170278.

It is an arithmetic number, because the mean of its divisors is an integer number (3474859816960).

Almost surely, 2^{51504171521881} is an apocalyptic number.

It is an amenable number.

51504171521881 is a deficient number, since it is larger than the sum of its proper divisors (4093585549479).

51504171521881 is a wasteful number, since it uses less digits than its factorization.

51504171521881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455816.

The product of its (nonzero) digits is 448000, while the sum is 49.

The spelling of 51504171521881 in words is "fifty-one trillion, five hundred four billion, one hundred seventy-one million, five hundred twenty-one thousand, eight hundred eighty-one".