51476646161 has 4 divisors (see below), whose sum is σ = 51478485300. Its totient is φ = 51474807024.

The previous prime is 51476646149. The next prime is 51476646167. The reversal of 51476646161 is 16164667415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4872040000 + 46604606161 = 69800^2 + 215881^2 .

It is a cyclic number.

It is not a de Polignac number, because 51476646161 - 2²⁶ = 51409537297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51476646167) 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, 876926 + ... + 933783.

It is an arithmetic number, because the mean of its divisors is an integer number (12869621325).

Almost surely, 2^51476646161 is an apocalyptic number.

It is an amenable number.

51476646161 is a deficient number, since it is larger than the sum of its proper divisors (1839139).

51476646161 is a wasteful number, since it uses less digits than its factorization.

51476646161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839138.

The product of its digits is 725760, while the sum is 47.

The spelling of 51476646161 in words is "fifty-one billion, four hundred seventy-six million, six hundred forty-six thousand, one hundred sixty-one".