166266662661 has 64 divisors (see below), whose sum is σ = 280500019200. Its totient is φ = 96420931200.

The previous prime is 166266662641. The next prime is 166266662669.

166266662661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166266662661 - 2¹¹ = 166266660613 is a prime.

It is a super-2 number, since 2×166266662661² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166266662598 and 166266662607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166266662669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 717970 + ... + 920876.

It is an arithmetic number, because the mean of its divisors is an integer number (4382812800).

Almost surely, 2^166266662661 is an apocalyptic number.

166266662661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166266662661 is a deficient number, since it is larger than the sum of its proper divisors (114233356539).

166266662661 is a wasteful number, since it uses less digits than its factorization.

166266662661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203047 (or 203041 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 54.

The spelling of 166266662661 in words is "one hundred sixty-six billion, two hundred sixty-six million, six hundred sixty-two thousand, six hundred sixty-one".