51678288257 has 4 divisors (see below), whose sum is σ = 52300918320. Its totient is φ = 51055658196.

The previous prime is 51678288239. The next prime is 51678288283. The reversal of 51678288257 is 75288287615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51678288257 - 2³² = 47383320961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51678288196 and 51678288205.

It is not an unprimeable number, because it can be changed into a prime (51678288227) 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, 311314907 + ... + 311315072.

It is an arithmetic number, because the mean of its divisors is an integer number (13075229580).

Almost surely, 2^51678288257 is an apocalyptic number.

It is an amenable number.

51678288257 is a deficient number, since it is larger than the sum of its proper divisors (622630063).

51678288257 is an equidigital number, since it uses as much as digits as its factorization.

51678288257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622630062.

The product of its digits is 15052800, while the sum is 59.

The spelling of 51678288257 in words is "fifty-one billion, six hundred seventy-eight million, two hundred eighty-eight thousand, two hundred fifty-seven".