166361643 has 24 divisors (see below), whose sum is σ = 290785248. Its totient is φ = 89471232.

The previous prime is 166361639. The next prime is 166361687. The reversal of 166361643 is 346163661.

166361643 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 6 + 1 + 643 = 666.

It is not a de Polignac number, because 166361643 - 2² = 166361639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166361598 and 166361607.

It is not an unprimeable number, because it can be changed into a prime (166361633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76596 + ... + 78737.

It is an arithmetic number, because the mean of its divisors is an integer number (12116052).

Almost surely, 2^166361643 is an apocalyptic number.

166361643 is a deficient number, since it is larger than the sum of its proper divisors (124423605).

166361643 is a wasteful number, since it uses less digits than its factorization.

166361643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155363 (or 155360 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 166361643 is about 12898.1255614915. The cubic root of 166361643 is about 549.9852811488.

The spelling of 166361643 in words is "one hundred sixty-six million, three hundred sixty-one thousand, six hundred forty-three".