51646774977 has 24 divisors (see below), whose sum is σ = 85322555136. Its totient is φ = 29490155136.

The previous prime is 51646774957. The next prime is 51646774981. The reversal of 51646774977 is 77947764615.

51646774977 is a `hidden beast` number, since 5 + 16 + 467 + 74 + 97 + 7 = 666.

It is not a de Polignac number, because 51646774977 - 2¹⁶ = 51646709441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (51646774957) 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, 225288 + ... + 392489.

It is an arithmetic number, because the mean of its divisors is an integer number (3555106464).

Almost surely, 2^51646774977 is an apocalyptic number.

It is an amenable number.

51646774977 is a deficient number, since it is larger than the sum of its proper divisors (33675780159).

51646774977 is a wasteful number, since it uses less digits than its factorization.

51646774977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619117 (or 619114 counting only the distinct ones).

The product of its digits is 62233920, while the sum is 63.

The spelling of 51646774977 in words is "fifty-one billion, six hundred forty-six million, seven hundred seventy-four thousand, nine hundred seventy-seven".