166461660 has 72 divisors (see below), whose sum is σ = 531520080. Its totient is φ = 42052608.

The previous prime is 166461629. The next prime is 166461667. The reversal of 166461660 is 66164661.

166461660 is a `hidden beast` number, since 1 + 6 + 646 + 1 + 6 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166461667) 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, 20917 + ... + 27756.

Almost surely, 2^166461660 is an apocalyptic number.

166461660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166461660 is an abundant number, since it is smaller than the sum of its proper divisors (365058420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166461660 is a wasteful number, since it uses less digits than its factorization.

166461660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48707 (or 48702 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 166461660 is about 12902.0021702060. The cubic root of 166461660 is about 550.0954765379.

The spelling of 166461660 in words is "one hundred sixty-six million, four hundred sixty-one thousand, six hundred sixty".