15597221023 has 2 divisors, whose sum is σ = 15597221024. Its totient is φ = 15597221022.

The previous prime is 15597220963. The next prime is 15597221063. The reversal of 15597221023 is 32012279551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15597221023 - 2⁹ = 15597220511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15597221063) 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, 7798610511 + 7798610512.

It is an arithmetic number, because the mean of its divisors is an integer number (7798610512).

Almost surely, 2^15597221023 is an apocalyptic number.

15597221023 is a deficient number, since it is larger than the sum of its proper divisors (1).

15597221023 is an equidigital number, since it uses as much as digits as its factorization.

15597221023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 15597221023 in words is "fifteen billion, five hundred ninety-seven million, two hundred twenty-one thousand, twenty-three".