166618740 has 24 divisors (see below), whose sum is σ = 466532640. Its totient is φ = 44431648.

The previous prime is 166618723. The next prime is 166618747. The reversal of 166618740 is 47816661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166618747) 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, 1388430 + ... + 1388549.

It is an arithmetic number, because the mean of its divisors is an integer number (19438860).

Almost surely, 2^166618740 is an apocalyptic number.

166618740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166618740 is an abundant number, since it is smaller than the sum of its proper divisors (299913900).

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

166618740 is a wasteful number, since it uses less digits than its factorization.

166618740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776991 (or 2776989 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 166618740 is about 12908.0881620788. The cubic root of 166618740 is about 550.2684529698.

The spelling of 166618740 in words is "one hundred sixty-six million, six hundred eighteen thousand, seven hundred forty".