815157663 has 8 divisors (see below), whose sum is σ = 1087872048. Its totient is φ = 542940864.

The previous prime is 815157661. The next prime is 815157689. The reversal of 815157663 is 366751518.

815157663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 815157663 - 2¹ = 815157661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815157661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120556 + ... + 127137.

It is an arithmetic number, because the mean of its divisors is an integer number (135984006).

Almost surely, 2^815157663 is an apocalyptic number.

815157663 is a deficient number, since it is larger than the sum of its proper divisors (272714385).

815157663 is a wasteful number, since it uses less digits than its factorization.

815157663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248793.

The product of its digits is 151200, while the sum is 42.

The square root of 815157663 is about 28550.9660607133. The cubic root of 815157663 is about 934.1440928626.

The spelling of 815157663 in words is "eight hundred fifteen million, one hundred fifty-seven thousand, six hundred sixty-three".