51666156532645 has 32 divisors (see below), whose sum is σ = 66781613606400. Its totient is φ = 38246085347904.

The previous prime is 51666156532637. The next prime is 51666156532769. The reversal of 51666156532645 is 54623565166615.

It is not a de Polignac number, because 51666156532645 - 2³ = 51666156532637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266747646 + ... + 266941264.

It is an arithmetic number, because the mean of its divisors is an integer number (2086925425200).

Almost surely, 2^{51666156532645} is an apocalyptic number.

It is an amenable number.

51666156532645 is a deficient number, since it is larger than the sum of its proper divisors (15115457073755).

51666156532645 is a wasteful number, since it uses less digits than its factorization.

51666156532645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259009.

The product of its digits is 116640000, while the sum is 61.

The spelling of 51666156532645 in words is "fifty-one trillion, six hundred sixty-six billion, one hundred fifty-six million, five hundred thirty-two thousand, six hundred forty-five".