51650065661661 has 24 divisors (see below), whose sum is σ = 75178390472640. Its totient is φ = 34169272958016.

The previous prime is 51650065661653. The next prime is 51650065661669. The reversal of 51650065661661 is 16616656005615.

51650065661661 is a `hidden beast` number, since 5 + 1 + 6 + 5 + 0 + 0 + 6 + 566 + 16 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (51650065661653) and next prime (51650065661669).

It is not a de Polignac number, because 51650065661661 - 2³ = 51650065661653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51650065661598 and 51650065661607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51650065661669) 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, 7280640 + ... + 12502313.

It is an arithmetic number, because the mean of its divisors is an integer number (3132432936360).

Almost surely, 2^{51650065661661} is an apocalyptic number.

It is an amenable number.

51650065661661 is a deficient number, since it is larger than the sum of its proper divisors (23528324810979).

51650065661661 is a wasteful number, since it uses less digits than its factorization.

51650065661661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19785185 (or 19785182 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 51650065661661 in words is "fifty-one trillion, six hundred fifty billion, sixty-five million, six hundred sixty-one thousand, six hundred sixty-one".