166961895 has 8 divisors (see below), whose sum is σ = 267139056. Its totient is φ = 89046336.

The previous prime is 166961891. The next prime is 166961909. The reversal of 166961895 is 598169661.

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

It is not a de Polignac number, because 166961895 - 2² = 166961891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166961891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5565382 + ... + 5565411.

It is an arithmetic number, because the mean of its divisors is an integer number (33392382).

Almost surely, 2^166961895 is an apocalyptic number.

166961895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166961895 is a deficient number, since it is larger than the sum of its proper divisors (100177161).

166961895 is a wasteful number, since it uses less digits than its factorization.

166961895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130801.

The product of its digits is 699840, while the sum is 51.

The square root of 166961895 is about 12921.3735724961. The cubic root of 166961895 is about 550.6459573004.

The spelling of 166961895 in words is "one hundred sixty-six million, nine hundred sixty-one thousand, eight hundred ninety-five".