815665532 has 12 divisors (see below), whose sum is σ = 1557179736. Its totient is φ = 370757040.

The previous prime is 815665517. The next prime is 815665547. The reversal of 815665532 is 235566518.

It is an interprime number because it is at equal distance from previous prime (815665517) and next prime (815665547).

It is a self number, because there is not a number n which added to its sum of digits gives 815665532.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9268883 + ... + 9268970.

It is an arithmetic number, because the mean of its divisors is an integer number (129764978).

Almost surely, 2^815665532 is an apocalyptic number.

It is an amenable number.

815665532 is a deficient number, since it is larger than the sum of its proper divisors (741514204).

815665532 is a wasteful number, since it uses less digits than its factorization.

815665532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18537868 (or 18537866 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The square root of 815665532 is about 28559.8587531521. The cubic root of 815665532 is about 934.3380530232.

The spelling of 815665532 in words is "eight hundred fifteen million, six hundred sixty-five thousand, five hundred thirty-two".