166610961 has 12 divisors (see below), whose sum is σ = 262538640. Its totient is φ = 100976280.

The previous prime is 166610903. The next prime is 166610987. The reversal of 166610961 is 169016661.

It is not a de Polignac number, because 166610961 - 2¹⁵ = 166578193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166610861) 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, 841371 + ... + 841568.

It is an arithmetic number, because the mean of its divisors is an integer number (21878220).

Almost surely, 2^166610961 is an apocalyptic number.

166610961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166610961 is a deficient number, since it is larger than the sum of its proper divisors (95927679).

166610961 is a wasteful number, since it uses less digits than its factorization.

166610961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682956 (or 1682953 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 166610961 is about 12907.7868358600. The cubic root of 166610961 is about 550.2598892974.

The spelling of 166610961 in words is "one hundred sixty-six million, six hundred ten thousand, nine hundred sixty-one".