166939401 has 4 divisors (see below), whose sum is σ = 222585872. Its totient is φ = 111292932.

The previous prime is 166939369. The next prime is 166939429. The reversal of 166939401 is 104939661.

166939401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166939401 - 2⁵ = 166939369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166939401.

It is not an unprimeable number, because it can be changed into a prime (166939471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27823231 + ... + 27823236.

It is an arithmetic number, because the mean of its divisors is an integer number (55646468).

Almost surely, 2^166939401 is an apocalyptic number.

It is an amenable number.

166939401 is a deficient number, since it is larger than the sum of its proper divisors (55646471).

166939401 is an equidigital number, since it uses as much as digits as its factorization.

166939401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55646470.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 166939401 is about 12920.5031248787. The cubic root of 166939401 is about 550.6212275330.

The spelling of 166939401 in words is "one hundred sixty-six million, nine hundred thirty-nine thousand, four hundred one".