815994610505 has 16 divisors (see below), whose sum is σ = 981315217920. Its totient is φ = 651381538752.

The previous prime is 815994610471. The next prime is 815994610517. The reversal of 815994610505 is 505016499518.

It is a cyclic number.

It is not a de Polignac number, because 815994610505 - 2¹⁸ = 815994348361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34148672 + ... + 34172558.

It is an arithmetic number, because the mean of its divisors is an integer number (61332201120).

Almost surely, 2^815994610505 is an apocalyptic number.

It is an amenable number.

815994610505 is a deficient number, since it is larger than the sum of its proper divisors (165320607415).

815994610505 is a wasteful number, since it uses less digits than its factorization.

815994610505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38408.

The product of its (nonzero) digits is 1944000, while the sum is 53.

The spelling of 815994610505 in words is "eight hundred fifteen billion, nine hundred ninety-four million, six hundred ten thousand, five hundred five".