51697569839 has 2 divisors, whose sum is σ = 51697569840. Its totient is φ = 51697569838.

The previous prime is 51697569727. The next prime is 51697569887. The reversal of 51697569839 is 93896579615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51697569839 - 2¹⁶ = 51697504303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51697569239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25848784919 + 25848784920.

It is an arithmetic number, because the mean of its divisors is an integer number (25848784920).

Almost surely, 2^51697569839 is an apocalyptic number.

51697569839 is a deficient number, since it is larger than the sum of its proper divisors (1).

51697569839 is an equidigital number, since it uses as much as digits as its factorization.

51697569839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110224800, while the sum is 68.

The spelling of 51697569839 in words is "fifty-one billion, six hundred ninety-seven million, five hundred sixty-nine thousand, eight hundred thirty-nine".