815193023447 has 16 divisors (see below), whose sum is σ = 941646062592. Its totient is φ = 697467112320.

The previous prime is 815193023443. The next prime is 815193023467. The reversal of 815193023447 is 744320391518.

It is not a de Polignac number, because 815193023447 - 2² = 815193023443 is a prime.

It is a super-2 number, since 2×815193023447² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815193023441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7162298 + ... + 7275224.

It is an arithmetic number, because the mean of its divisors is an integer number (58852878912).

Almost surely, 2^815193023447 is an apocalyptic number.

815193023447 is a deficient number, since it is larger than the sum of its proper divisors (126453039145).

815193023447 is a wasteful number, since it uses less digits than its factorization.

815193023447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151558.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 815193023447 in words is "eight hundred fifteen billion, one hundred ninety-three million, twenty-three thousand, four hundred forty-seven".