51690657277 has 12 divisors (see below), whose sum is σ = 60343949916. Its totient is φ = 44148592320.

The previous prime is 51690657247. The next prime is 51690657281. The reversal of 51690657277 is 77275609615.

It can be written as a sum of positive squares in 2 ways, for example, as 43578232516 + 8112424761 = 208754^2 + 90069^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51690657277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51690657247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1863298 + ... + 1890835.

It is an arithmetic number, because the mean of its divisors is an integer number (5028662493).

Almost surely, 2^51690657277 is an apocalyptic number.

It is an amenable number.

51690657277 is a deficient number, since it is larger than the sum of its proper divisors (8653292639).

51690657277 is a wasteful number, since it uses less digits than its factorization.

51690657277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3754428 (or 3754421 counting only the distinct ones).

The product of its (nonzero) digits is 5556600, while the sum is 55.

The spelling of 51690657277 in words is "fifty-one billion, six hundred ninety million, six hundred fifty-seven thousand, two hundred seventy-seven".