166601640 has 64 divisors (see below), whose sum is σ = 501370560. Its totient is φ = 44288000.

The previous prime is 166601623. The next prime is 166601689. The reversal of 166601640 is 46106661.

166601640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166601640² = 55512212901379200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 166601598 and 166601607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39640 + ... + 43640.

It is an arithmetic number, because the mean of its divisors is an integer number (7833915).

Almost surely, 2^166601640 is an apocalyptic number.

166601640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166601640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250685280).

166601640 is an abundant number, since it is smaller than the sum of its proper divisors (334768920).

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

166601640 is a wasteful number, since it uses less digits than its factorization.

166601640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362 (or 4358 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 166601640 is about 12907.4257696878. The cubic root of 166601640 is about 550.2496277315.

The spelling of 166601640 in words is "one hundred sixty-six million, six hundred one thousand, six hundred forty".