51556601065 has 16 divisors (see below), whose sum is σ = 61984670976. Its totient is φ = 41167526400.

The previous prime is 51556601039. The next prime is 51556601069. The reversal of 51556601065 is 56010665515.

It is not a de Polignac number, because 51556601065 - 2⁷ = 51556600937 is a prime.

It is a super-2 number, since 2×51556601065² (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 (51556601069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6970009 + ... + 6977401.

It is an arithmetic number, because the mean of its divisors is an integer number (3874041936).

Almost surely, 2^51556601065 is an apocalyptic number.

It is an amenable number.

51556601065 is a deficient number, since it is larger than the sum of its proper divisors (10428069911).

51556601065 is a wasteful number, since it uses less digits than its factorization.

51556601065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 51556601065 in words is "fifty-one billion, five hundred fifty-six million, six hundred one thousand, sixty-five".