51665092785 has 64 divisors (see below), whose sum is σ = 97952198400. Its totient is φ = 25747117056.

The previous prime is 51665092777. The next prime is 51665092789. The reversal of 51665092785 is 58729056615.

51665092785 is a `hidden beast` number, since 5 + 1 + 66 + 509 + 2 + 78 + 5 = 666.

It is not a de Polignac number, because 51665092785 - 2³ = 51665092777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51665092789) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 238027 + ... + 399983.

It is an arithmetic number, because the mean of its divisors is an integer number (1530503100).

Almost surely, 2^51665092785 is an apocalyptic number.

It is an amenable number.

51665092785 is a deficient number, since it is larger than the sum of its proper divisors (46287105615).

51665092785 is a wasteful number, since it uses less digits than its factorization.

51665092785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162127 (or 162121 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 51665092785 in words is "fifty-one billion, six hundred sixty-five million, ninety-two thousand, seven hundred eighty-five".