166207640 has 32 divisors (see below), whose sum is σ = 395966880. Its totient is φ = 62572032.

The previous prime is 166207633. The next prime is 166207667. The reversal of 166207640 is 46702661.

It is a junction number, because it is equal to n+sod(n) for n = 166207597 and 166207606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121532 + ... + 122891.

It is an arithmetic number, because the mean of its divisors is an integer number (12373965).

Almost surely, 2^166207640 is an apocalyptic number.

166207640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166207640 is an abundant number, since it is smaller than the sum of its proper divisors (229759240).

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

166207640 is a wasteful number, since it uses less digits than its factorization.

166207640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244451 (or 244447 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 166207640 is about 12892.1542032354. The cubic root of 166207640 is about 549.8155193958.

The spelling of 166207640 in words is "one hundred sixty-six million, two hundred seven thousand, six hundred forty".