815569380091 has 2 divisors, whose sum is σ = 815569380092. Its totient is φ = 815569380090.

The previous prime is 815569380023. The next prime is 815569380103. The reversal of 815569380091 is 190083965518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 815569380091 - 2³⁷ = 678130426619 is a prime.

It is not a weakly prime, because it can be changed into another prime (815569380491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407784690045 + 407784690046.

It is an arithmetic number, because the mean of its divisors is an integer number (407784690046).

Almost surely, 2^815569380091 is an apocalyptic number.

815569380091 is a deficient number, since it is larger than the sum of its proper divisors (1).

815569380091 is an equidigital number, since it uses as much as digits as its factorization.

815569380091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 815569380091 in words is "eight hundred fifteen billion, five hundred sixty-nine million, three hundred eighty thousand, ninety-one".