1665055165515 has 32 divisors (see below), whose sum is σ = 3044820326400. Its totient is φ = 761131069824.

The previous prime is 1665055165489. The next prime is 1665055165523. The reversal of 1665055165515 is 5155615505661.

It is not a de Polignac number, because 1665055165515 - 2⁸ = 1665055165259 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1845742 + ... + 2595548.

It is an arithmetic number, because the mean of its divisors is an integer number (95150635200).

Almost surely, 2^{1665055165515} is an apocalyptic number.

1665055165515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1665055165515 is a deficient number, since it is larger than the sum of its proper divisors (1379765160885).

1665055165515 is a wasteful number, since it uses less digits than its factorization.

1665055165515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770971.

The product of its (nonzero) digits is 3375000, while the sum is 51.

The spelling of 1665055165515 in words is "one trillion, six hundred sixty-five billion, fifty-five million, one hundred sixty-five thousand, five hundred fifteen".