51699161961 has 24 divisors (see below), whose sum is σ = 76131211520. Its totient is φ = 33799350816.

The previous prime is 51699161951. The next prime is 51699162017. The reversal of 51699161961 is 16916199615.

51699161961 is a `hidden beast` number, since 5 + 16 + 9 + 9 + 1 + 619 + 6 + 1 = 666.

It is not a de Polignac number, because 51699161961 - 2¹¹ = 51699159913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51699161898 and 51699161907.

It is not an unprimeable number, because it can be changed into a prime (51699161911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57766 + ... + 326703.

Almost surely, 2^51699161961 is an apocalyptic number.

It is an amenable number.

51699161961 is a deficient number, since it is larger than the sum of its proper divisors (24432049559).

51699161961 is a wasteful number, since it uses less digits than its factorization.

51699161961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384765 (or 384762 counting only the distinct ones).

The product of its digits is 787320, while the sum is 54.

The spelling of 51699161961 in words is "fifty-one billion, six hundred ninety-nine million, one hundred sixty-one thousand, nine hundred sixty-one".