51605113979 has 2 divisors, whose sum is σ = 51605113980. Its totient is φ = 51605113978.

The previous prime is 51605113969. The next prime is 51605114021. The reversal of 51605113979 is 97931150615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51605113979 - 2²⁴ = 51588336763 is a prime.

It is not a weakly prime, because it can be changed into another prime (51605113969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25802556989 + 25802556990.

It is an arithmetic number, because the mean of its divisors is an integer number (25802556990).

Almost surely, 2^51605113979 is an apocalyptic number.

51605113979 is a deficient number, since it is larger than the sum of its proper divisors (1).

51605113979 is an equidigital number, since it uses as much as digits as its factorization.

51605113979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 255150, while the sum is 47.

The spelling of 51605113979 in words is "fifty-one billion, six hundred five million, one hundred thirteen thousand, nine hundred seventy-nine".