815898581923 has 2 divisors, whose sum is σ = 815898581924. Its totient is φ = 815898581922.

The previous prime is 815898581903. The next prime is 815898581983. The reversal of 815898581923 is 329185898518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 815898581923 - 2⁵ = 815898581891 is a prime.

It is not a weakly prime, because it can be changed into another prime (815898581903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407949290961 + 407949290962.

It is an arithmetic number, because the mean of its divisors is an integer number (407949290962).

Almost surely, 2^815898581923 is an apocalyptic number.

815898581923 is a deficient number, since it is larger than the sum of its proper divisors (1).

815898581923 is an equidigital number, since it uses as much as digits as its factorization.

815898581923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49766400, while the sum is 67.

The spelling of 815898581923 in words is "eight hundred fifteen billion, eight hundred ninety-eight million, five hundred eighty-one thousand, nine hundred twenty-three".