815193023457 has 16 divisors (see below), whose sum is σ = 1096284849408. Its totient is φ = 538800829440.

The previous prime is 815193023443. The next prime is 815193023467. The reversal of 815193023457 is 754320391518.

It is not a de Polignac number, because 815193023457 - 2⁴ = 815193023441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (815193023467) 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, 2232969 + ... + 2572262.

It is an arithmetic number, because the mean of its divisors is an integer number (68517803088).

Almost surely, 2^815193023457 is an apocalyptic number.

It is an amenable number.

815193023457 is a deficient number, since it is larger than the sum of its proper divisors (281091825951).

815193023457 is a wasteful number, since it uses less digits than its factorization.

815193023457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805720.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 815193023457 in words is "eight hundred fifteen billion, one hundred ninety-three million, twenty-three thousand, four hundred fifty-seven".