166616640 has 84 divisors (see below), whose sum is σ = 573101724. Its totient is φ = 44430336.

The previous prime is 166616627. The next prime is 166616647. The reversal of 166616640 is 46616661.

166616640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 37748736 + 128867904 = 6144^2 + 11352^2 .

It is a super-2 number, since 2×166616640² = 55522209449779200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 166616595 and 166616604.

It is not an unprimeable number, because it can be changed into a prime (166616647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26047 + ... + 31806.

Almost surely, 2^166616640 is an apocalyptic number.

166616640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166616640 is an abundant number, since it is smaller than the sum of its proper divisors (406485084).

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

166616640 is a wasteful number, since it uses less digits than its factorization.

166616640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57876 (or 57863 counting only the distinct ones).

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

The square root of 166616640 is about 12908.0068174757. The cubic root of 166616640 is about 550.2661411678.

The spelling of 166616640 in words is "one hundred sixty-six million, six hundred sixteen thousand, six hundred forty".