166610666511 has 12 divisors (see below), whose sum is σ = 241353400392. Its totient is φ = 110753678256.

The previous prime is 166610666507. The next prime is 166610666527. The reversal of 166610666511 is 115666016661.

It is not a de Polignac number, because 166610666511 - 2² = 166610666507 is a prime.

It is a super-2 number, since 2×166610666511² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166610666111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26671656 + ... + 26677901.

It is an arithmetic number, because the mean of its divisors is an integer number (20112783366).

Almost surely, 2^166610666511 is an apocalyptic number.

166610666511 is a deficient number, since it is larger than the sum of its proper divisors (74742733881).

166610666511 is a wasteful number, since it uses less digits than its factorization.

166610666511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53349910 (or 53349907 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 166610666511 in words is "one hundred sixty-six billion, six hundred ten million, six hundred sixty-six thousand, five hundred eleven".