166994499661 has 16 divisors (see below), whose sum is σ = 183100694400. Its totient is φ = 151044382720.

The previous prime is 166994499653. The next prime is 166994499799.

166994499661 is nontrivially palindromic in base 10.

166994499661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166994499661 - 2³ = 166994499653 is a prime.

It is a super-2 number, since 2×166994499661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166994499611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1695576 + ... + 1791358.

It is an arithmetic number, because the mean of its divisors is an integer number (11443793400).

Almost surely, 2^166994499661 is an apocalyptic number.

166994499661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166994499661 is a deficient number, since it is larger than the sum of its proper divisors (16106194739).

166994499661 is a wasteful number, since it uses less digits than its factorization.

166994499661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96596.

The product of its digits is 136048896, while the sum is 70.

The spelling of 166994499661 in words is "one hundred sixty-six billion, nine hundred ninety-four million, four hundred ninety-nine thousand, six hundred sixty-one".