166516605506515 has 16 divisors (see below), whose sum is σ = 217985854702176. Its totient is φ = 121102719033600.

The previous prime is 166516605506467. The next prime is 166516605506519. The reversal of 166516605506515 is 515605506615661.

It is not a de Polignac number, because 166516605506515 - 2²¹ = 166516603409363 is a prime.

It is a super-4 number, since 4×166516605506515⁴ (a number of 58 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166516605506515.

It is not an unprimeable number, because it can be changed into a prime (166516605506519) 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, 23855305 + ... + 30035125.

It is an arithmetic number, because the mean of its divisors is an integer number (13624115918886).

Almost surely, 2^{166516605506515} is an apocalyptic number.

166516605506515 is a deficient number, since it is larger than the sum of its proper divisors (51469249195661).

166516605506515 is a wasteful number, since it uses less digits than its factorization.

166516605506515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6669750.

The product of its (nonzero) digits is 24300000, while the sum is 58.

The spelling of 166516605506515 in words is "one hundred sixty-six trillion, five hundred sixteen billion, six hundred five million, five hundred six thousand, five hundred fifteen".