1515166665 has 16 divisors (see below), whose sum is σ = 2428123776. Its totient is φ = 806803200.

The previous prime is 1515166649. The next prime is 1515166729. The reversal of 1515166665 is 5666615151.

It is not a de Polignac number, because 1515166665 - 2⁴ = 1515166649 is a prime.

It is a Curzon number.

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, 70576 + ... + 89505.

It is an arithmetic number, because the mean of its divisors is an integer number (151757736).

Almost surely, 2^1515166665 is an apocalyptic number.

1515166665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1515166665 is a deficient number, since it is larger than the sum of its proper divisors (912957111).

1515166665 is a wasteful number, since it uses less digits than its factorization.

1515166665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160720.

The product of its digits is 162000, while the sum is 42.

The square root of 1515166665 is about 38925.1418109170. The cubic root of 1515166665 is about 1148.5594223892.

The spelling of 1515166665 in words is "one billion, five hundred fifteen million, one hundred sixty-six thousand, six hundred sixty-five".