51564398081 has 8 divisors (see below), whose sum is σ = 58942597440. Its totient is φ = 44189162928.

The previous prime is 51564398059. The next prime is 51564398087. The reversal of 51564398081 is 18089346515.

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 51564398081 - 2³⁴ = 34384528897 is a prime.

It is a super-2 number, since 2×51564398081² (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 (51564398087) 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, 703646 + ... + 773463.

It is an arithmetic number, because the mean of its divisors is an integer number (7367824680).

Almost surely, 2^51564398081 is an apocalyptic number.

It is an amenable number.

51564398081 is a deficient number, since it is larger than the sum of its proper divisors (7378199359).

51564398081 is a wasteful number, since it uses less digits than its factorization.

51564398081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482103.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 51564398081 in words is "fifty-one billion, five hundred sixty-four million, three hundred ninety-eight thousand, eighty-one".