166501666615 has 8 divisors (see below), whose sum is σ = 201375244800. Its totient is φ = 132152503392.

The previous prime is 166501666603. The next prime is 166501666621. The reversal of 166501666615 is 516666105661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166501666615 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131103040 + ... + 131104309.

It is an arithmetic number, because the mean of its divisors is an integer number (25171905600).

Almost surely, 2^166501666615 is an apocalyptic number.

166501666615 is a deficient number, since it is larger than the sum of its proper divisors (34873578185).

166501666615 is a wasteful number, since it uses less digits than its factorization.

166501666615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262207481.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 166501666615 in words is "one hundred sixty-six billion, five hundred one million, six hundred sixty-six thousand, six hundred fifteen".