815364564689 has 2 divisors, whose sum is σ = 815364564690. Its totient is φ = 815364564688.

The previous prime is 815364564673. The next prime is 815364564697. The reversal of 815364564689 is 986465463518.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811909123600 + 3455441089 = 901060^2 + 58783^2 .

It is a cyclic number.

It is not a de Polignac number, because 815364564689 - 2⁴ = 815364564673 is a prime.

It is not a weakly prime, because it can be changed into another prime (815364564629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407682282344 + 407682282345.

It is an arithmetic number, because the mean of its divisors is an integer number (407682282345).

Almost surely, 2^815364564689 is an apocalyptic number.

It is an amenable number.

815364564689 is a deficient number, since it is larger than the sum of its proper divisors (1).

815364564689 is an equidigital number, since it uses as much as digits as its factorization.

815364564689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 149299200, while the sum is 65.

The spelling of 815364564689 in words is "eight hundred fifteen billion, three hundred sixty-four million, five hundred sixty-four thousand, six hundred eighty-nine".