51577531207 has 4 divisors (see below), whose sum is σ = 52674925536. Its totient is φ = 50480136880.

The previous prime is 51577531193. The next prime is 51577531217. The reversal of 51577531207 is 70213577515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51577531207 - 2⁷ = 51577531079 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 (51577531217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548697094 + ... + 548697187.

It is an arithmetic number, because the mean of its divisors is an integer number (13168731384).

Almost surely, 2^51577531207 is an apocalyptic number.

51577531207 is a deficient number, since it is larger than the sum of its proper divisors (1097394329).

51577531207 is a wasteful number, since it uses less digits than its factorization.

51577531207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097394328.

The product of its (nonzero) digits is 257250, while the sum is 43.

The spelling of 51577531207 in words is "fifty-one billion, five hundred seventy-seven million, five hundred thirty-one thousand, two hundred seven".