166391061 has 8 divisors (see below), whose sum is σ = 223094880. Its totient is φ = 110307312.

The previous prime is 166390967. The next prime is 166391063. The reversal of 166391061 is 160193661.

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

It is not a de Polignac number, because 166391061 - 2⁷ = 166390933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166391063) 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, 154390 + ... + 155463.

It is an arithmetic number, because the mean of its divisors is an integer number (27886860).

Almost surely, 2^166391061 is an apocalyptic number.

It is an amenable number.

166391061 is a deficient number, since it is larger than the sum of its proper divisors (56703819).

166391061 is a wasteful number, since it uses less digits than its factorization.

166391061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310035.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 166391061 is about 12899.2659093454. The cubic root of 166391061 is about 550.0176975022.

The spelling of 166391061 in words is "one hundred sixty-six million, three hundred ninety-one thousand, sixty-one".