51698915619 has 16 divisors (see below), whose sum is σ = 74238888864. Its totient is φ = 31812768000.

The previous prime is 51698915581. The next prime is 51698915651. The reversal of 51698915619 is 91651989615.

51698915619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-51698915619 is a prime.

It is a super-2 number, since 2×51698915619² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51698915819) 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, 852919 + ... + 911519.

It is an arithmetic number, because the mean of its divisors is an integer number (4639930554).

Almost surely, 2^51698915619 is an apocalyptic number.

51698915619 is a deficient number, since it is larger than the sum of its proper divisors (22539973245).

51698915619 is a wasteful number, since it uses less digits than its factorization.

51698915619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81238.

The product of its digits is 5248800, while the sum is 60.

The spelling of 51698915619 in words is "fifty-one billion, six hundred ninety-eight million, nine hundred fifteen thousand, six hundred nineteen".