51149610657 has 6 divisors (see below), whose sum is σ = 73882770962. Its totient is φ = 34099740432.

The previous prime is 51149610653. The next prime is 51149610679. The reversal of 51149610657 is 75601694115.

51149610657 is a `hidden beast` number, since 5 + 1 + 1 + 496 + 106 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41045139216 + 10104471441 = 202596^2 + 100521^2 .

It is not a de Polignac number, because 51149610657 - 2² = 51149610653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51149610653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2841645028 + ... + 2841645045.

Almost surely, 2^51149610657 is an apocalyptic number.

It is an amenable number.

51149610657 is a deficient number, since it is larger than the sum of its proper divisors (22733160305).

51149610657 is a wasteful number, since it uses less digits than its factorization.

51149610657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683290079 (or 5683290076 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 51149610657 in words is "fifty-one billion, one hundred forty-nine million, six hundred ten thousand, six hundred fifty-seven".