51506875699 has 2 divisors, whose sum is σ = 51506875700. Its totient is φ = 51506875698.

The previous prime is 51506875649. The next prime is 51506875709. The reversal of 51506875699 is 99657860515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51506875699 - 2⁹ = 51506875187 is a prime.

It is not a weakly prime, because it can be changed into another prime (51506875649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25753437849 + 25753437850.

It is an arithmetic number, because the mean of its divisors is an integer number (25753437850).

Almost surely, 2^51506875699 is an apocalyptic number.

51506875699 is a deficient number, since it is larger than the sum of its proper divisors (1).

51506875699 is an equidigital number, since it uses as much as digits as its factorization.

51506875699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412000, while the sum is 61.

The spelling of 51506875699 in words is "fifty-one billion, five hundred six million, eight hundred seventy-five thousand, six hundred ninety-nine".