166041591 has 8 divisors (see below), whose sum is σ = 221458944. Its totient is φ = 110659320.

The previous prime is 166041581. The next prime is 166041599. The reversal of 166041591 is 195140661.

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

It is not a de Polignac number, because 166041591 - 2⁹ = 166041079 is a prime.

It is a super-2 number, since 2×166041591² = 55139619883622562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166041599) 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 7 ways as a sum of consecutive naturals, for example, 5676 + ... + 19086.

It is an arithmetic number, because the mean of its divisors is an integer number (27682368).

Almost surely, 2^166041591 is an apocalyptic number.

166041591 is a deficient number, since it is larger than the sum of its proper divisors (55417353).

166041591 is a wasteful number, since it uses less digits than its factorization.

166041591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17541.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 166041591 is about 12885.7126694646. The cubic root of 166041591 is about 549.6323614753.

The spelling of 166041591 in words is "one hundred sixty-six million, forty-one thousand, five hundred ninety-one".