51538511907 has 24 divisors (see below), whose sum is σ = 80000094096. Its totient is φ = 31855228416.

The previous prime is 51538511863. The next prime is 51538511911. The reversal of 51538511907 is 70911583515.

51538511907 is a `hidden beast` number, since 5 + 15 + 38 + 511 + 90 + 7 = 666.

It is not a de Polignac number, because 51538511907 - 2¹⁴ = 51538495523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51538511917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2503578 + ... + 2524079.

It is an arithmetic number, because the mean of its divisors is an integer number (3333337254).

Almost surely, 2^51538511907 is an apocalyptic number.

51538511907 is a deficient number, since it is larger than the sum of its proper divisors (28461582189).

51538511907 is a wasteful number, since it uses less digits than its factorization.

51538511907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027747 (or 5027744 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 45.

The spelling of 51538511907 in words is "fifty-one billion, five hundred thirty-eight million, five hundred eleven thousand, nine hundred seven".