166953661 has 8 divisors (see below), whose sum is σ = 191428160. Its totient is φ = 142635168.

The previous prime is 166953653. The next prime is 166953671. The reversal of 166953661 is 166359661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166953661 - 2³ = 166953653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166953641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36696 + ... + 40993.

It is an arithmetic number, because the mean of its divisors is an integer number (23928520).

Almost surely, 2^166953661 is an apocalyptic number.

It is an amenable number.

166953661 is a deficient number, since it is larger than the sum of its proper divisors (24474499).

166953661 is an equidigital number, since it uses as much as digits as its factorization.

166953661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78003.

The product of its digits is 174960, while the sum is 43.

The square root of 166953661 is about 12921.0549491905. The cubic root of 166953661 is about 550.6369051484.

The spelling of 166953661 in words is "one hundred sixty-six million, nine hundred fifty-three thousand, six hundred sixty-one".