51661651116163 has 16 divisors (see below), whose sum is σ = 58811614500096. Its totient is φ = 44920810913440.

The previous prime is 51661651116161. The next prime is 51661651116169. The reversal of 51661651116163 is 36161115616615.

It is not a de Polignac number, because 51661651116163 - 2¹ = 51661651116161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51661651116161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546781 + ... + 10179502.

It is an arithmetic number, because the mean of its divisors is an integer number (3675725906256).

Almost surely, 2^{51661651116163} is an apocalyptic number.

51661651116163 is a deficient number, since it is larger than the sum of its proper divisors (7149963383933).

51661651116163 is a wasteful number, since it uses less digits than its factorization.

51661651116163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10745354.

The product of its digits is 583200, while the sum is 49.

The spelling of 51661651116163 in words is "fifty-one trillion, six hundred sixty-one billion, six hundred fifty-one million, one hundred sixteen thousand, one hundred sixty-three".