166015620665013 has 16 divisors (see below), whose sum is σ = 266290719864320. Its totient is φ = 89873117953776.

The previous prime is 166015620665009. The next prime is 166015620665023. The reversal of 166015620665013 is 310566026510661.

It is not a de Polignac number, because 166015620665013 - 2² = 166015620665009 is a prime.

It is a super-2 number, since 2×166015620665013² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166015620665023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208039624495 + ... + 208039625292.

It is an arithmetic number, because the mean of its divisors is an integer number (16643169991520).

Almost surely, 2^{166015620665013} is an apocalyptic number.

It is an amenable number.

166015620665013 is a deficient number, since it is larger than the sum of its proper divisors (100275099199307).

166015620665013 is a wasteful number, since it uses less digits than its factorization.

166015620665013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416079249816.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 166015620665013 in words is "one hundred sixty-six trillion, fifteen billion, six hundred twenty million, six hundred sixty-five thousand, thirteen".