166402207 has 4 divisors (see below), whose sum is σ = 167065416. Its totient is φ = 165739000.

The previous prime is 166402199. The next prime is 166402219. The reversal of 166402207 is 702204661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 702204661 = 1367 ⋅513683.

It is a cyclic number.

It is not a de Polignac number, because 166402207 - 2³ = 166402199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166402237) 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, 331228 + ... + 331729.

It is an arithmetic number, because the mean of its divisors is an integer number (41766354).

Almost surely, 2^166402207 is an apocalyptic number.

166402207 is a deficient number, since it is larger than the sum of its proper divisors (663209).

166402207 is an equidigital number, since it uses as much as digits as its factorization.

166402207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663208.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 166402207 is about 12899.6979422000. The cubic root of 166402207 is about 550.0299785312.

Adding to 166402207 its reverse (702204661), we get a palindrome (868606868).

The spelling of 166402207 in words is "one hundred sixty-six million, four hundred two thousand, two hundred seven".