51125506545664 has 48 divisors (see below), whose sum is σ = 102228315953400. Its totient is φ = 25562186514432.

The previous prime is 51125506545661. The next prime is 51125506545667. The reversal of 51125506545664 is 46654560552115.

It is an interprime number because it is at equal distance from previous prime (51125506545661) and next prime (51125506545667).

It is a super-2 number, since 2×51125506545664² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51125506545661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101199807 + ... + 101703745.

Almost surely, 2^{51125506545664} is an apocalyptic number.

It is an amenable number.

51125506545664 is a deficient number, since it is larger than the sum of its proper divisors (51102809407736).

51125506545664 is an equidigital number, since it uses as much as digits as its factorization.

51125506545664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553498 (or 553478 counting only the distinct ones).

The product of its (nonzero) digits is 21600000, while the sum is 55.

The spelling of 51125506545664 in words is "fifty-one trillion, one hundred twenty-five billion, five hundred six million, five hundred forty-five thousand, six hundred sixty-four".