51641644616532 has 24 divisors (see below), whose sum is σ = 133885745302400. Its totient is φ = 17213881538808.

The previous prime is 51641644616531. The next prime is 51641644616539. The reversal of 51641644616532 is 23561644614615.

51641644616532 is a `hidden beast` number, since 5 + 1 + 6 + 4 + 1 + 6 + 44 + 61 + 6 + 532 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51641644616531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239081687932 + ... + 239081688147.

Almost surely, 2^{51641644616532} is an apocalyptic number.

It is an amenable number.

51641644616532 is an abundant number, since it is smaller than the sum of its proper divisors (82244100685868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51641644616532 is a wasteful number, since it uses less digits than its factorization.

51641644616532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478163376092 (or 478163376084 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 51641644616532 in words is "fifty-one trillion, six hundred forty-one billion, six hundred forty-four million, six hundred sixteen thousand, five hundred thirty-two".