51566553645645 has 16 divisors (see below), whose sum is σ = 82518951090240. Its totient is φ = 27498006858624.

The previous prime is 51566553645613. The next prime is 51566553645653. The reversal of 51566553645645 is 54654635566515.

It is not a de Polignac number, because 51566553645645 - 2⁵ = 51566553645613 is a prime.

It is a super-3 number, since 3×51566553645645³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259590264 + ... + 259788833.

It is an arithmetic number, because the mean of its divisors is an integer number (5157434443140).

Almost surely, 2^{51566553645645} is an apocalyptic number.

It is an amenable number.

51566553645645 is a deficient number, since it is larger than the sum of its proper divisors (30952397444595).

51566553645645 is a wasteful number, since it uses less digits than its factorization.

51566553645645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519385724.

The product of its digits is 972000000, while the sum is 66.

The spelling of 51566553645645 in words is "fifty-one trillion, five hundred sixty-six billion, five hundred fifty-three million, six hundred forty-five thousand, six hundred forty-five".