1659491515 has 24 divisors (see below), whose sum is σ = 2271025008. Its totient is φ = 1154408640.

The previous prime is 1659491507. The next prime is 1659491593. The reversal of 1659491515 is 5151949561.

It is not a de Polignac number, because 1659491515 - 2³ = 1659491507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 577 + ... + 57613.

It is an arithmetic number, because the mean of its divisors is an integer number (94626042).

Almost surely, 2^1659491515 is an apocalyptic number.

1659491515 is a deficient number, since it is larger than the sum of its proper divisors (611533493).

1659491515 is a wasteful number, since it uses less digits than its factorization.

1659491515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57099 (or 57076 counting only the distinct ones).

The product of its digits is 243000, while the sum is 46.

The square root of 1659491515 is about 40736.8569602516. The cubic root of 1659491515 is about 1183.9272374611.

The spelling of 1659491515 in words is "one billion, six hundred fifty-nine million, four hundred ninety-one thousand, five hundred fifteen".