51901905867 has 16 divisors (see below), whose sum is σ = 79140325632. Its totient is φ = 29638841760.

The previous prime is 51901905851. The next prime is 51901905907. The reversal of 51901905867 is 76850910915.

51901905867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51901905867 - 2⁴ = 51901905851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51901905817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775008 + ... + 839309.

It is an arithmetic number, because the mean of its divisors is an integer number (4946270352).

Almost surely, 2^51901905867 is an apocalyptic number.

51901905867 is a deficient number, since it is larger than the sum of its proper divisors (27238419765).

51901905867 is a wasteful number, since it uses less digits than its factorization.

51901905867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615858.

The product of its (nonzero) digits is 680400, while the sum is 51.

The spelling of 51901905867 in words is "fifty-one billion, nine hundred one million, nine hundred five thousand, eight hundred sixty-seven".