11598721657 has 2 divisors, whose sum is σ = 11598721658. Its totient is φ = 11598721656.

The previous prime is 11598721639. The next prime is 11598721679. The reversal of 11598721657 is 75612789511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10035230976 + 1563490681 = 100176^2 + 39541^2 .

It is a cyclic number.

It is not a de Polignac number, because 11598721657 - 2²⁷ = 11464503929 is a prime.

It is not a weakly prime, because it can be changed into another prime (11598721697) 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, 5799360828 + 5799360829.

It is an arithmetic number, because the mean of its divisors is an integer number (5799360829).

Almost surely, 2^11598721657 is an apocalyptic number.

It is an amenable number.

11598721657 is a deficient number, since it is larger than the sum of its proper divisors (1).

11598721657 is an equidigital number, since it uses as much as digits as its factorization.

11598721657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 52.

The spelling of 11598721657 in words is "eleven billion, five hundred ninety-eight million, seven hundred twenty-one thousand, six hundred fifty-seven".