51871790881 has 8 divisors (see below), whose sum is σ = 51990347520. Its totient is φ = 51753277968.

The previous prime is 51871790869. The next prime is 51871790899. The reversal of 51871790881 is 18809717815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51871790881 - 2⁵ = 51871790849 is a prime.

It is a super-2 number, since 2×51871790881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51871794881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3938950 + ... + 3952096.

It is an arithmetic number, because the mean of its divisors is an integer number (6498793440).

Almost surely, 2^51871790881 is an apocalyptic number.

It is an amenable number.

51871790881 is a deficient number, since it is larger than the sum of its proper divisors (118556639).

51871790881 is a wasteful number, since it uses less digits than its factorization.

51871790881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21863.

The product of its (nonzero) digits is 1128960, while the sum is 55.

The spelling of 51871790881 in words is "fifty-one billion, eight hundred seventy-one million, seven hundred ninety thousand, eight hundred eighty-one".