13920306857 has 2 divisors, whose sum is σ = 13920306858. Its totient is φ = 13920306856.

The previous prime is 13920306817. The next prime is 13920306893. The reversal of 13920306857 is 75860302931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13191900736 + 728406121 = 114856^2 + 26989^2 .

It is a cyclic number.

It is not a de Polignac number, because 13920306857 - 2⁶ = 13920306793 is a prime.

It is not a weakly prime, because it can be changed into another prime (13920306817) 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, 6960153428 + 6960153429.

It is an arithmetic number, because the mean of its divisors is an integer number (6960153429).

Almost surely, 2^13920306857 is an apocalyptic number.

It is an amenable number.

13920306857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13920306857 is an equidigital number, since it uses as much as digits as its factorization.

13920306857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 13920306857 in words is "thirteen billion, nine hundred twenty million, three hundred six thousand, eight hundred fifty-seven".