166244442661 has 16 divisors (see below), whose sum is σ = 182179071360. Its totient is φ = 150447568320.

The previous prime is 166244442659. The next prime is 166244442691.

166244442661 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 166244442661 - 2¹ = 166244442659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166244442691) 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, 4113991 + ... + 4154203.

It is an arithmetic number, because the mean of its divisors is an integer number (11386191960).

Almost surely, 2^166244442661 is an apocalyptic number.

166244442661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166244442661 is a deficient number, since it is larger than the sum of its proper divisors (15934628699).

166244442661 is a wasteful number, since it uses less digits than its factorization.

166244442661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41916.

The product of its digits is 1327104, while the sum is 46.

The spelling of 166244442661 in words is "one hundred sixty-six billion, two hundred forty-four million, four hundred forty-two thousand, six hundred sixty-one".