166402257 has 8 divisors (see below), whose sum is σ = 253565376. Its totient is φ = 95086992.

The previous prime is 166402237. The next prime is 166402277. The reversal of 166402257 is 752204661.

166402257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166402237) and next prime (166402277).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166402257 - 2⁶ = 166402193 is a prime.

It is a super-2 number, since 2×166402257² = 55379422269388098, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 3961938 + ... + 3961979.

It is an arithmetic number, because the mean of its divisors is an integer number (31695672).

Almost surely, 2^166402257 is an apocalyptic number.

It is an amenable number.

166402257 is a deficient number, since it is larger than the sum of its proper divisors (87163119).

166402257 is an equidigital number, since it uses as much as digits as its factorization.

166402257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7923927.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 166402257 is about 12899.6998802298. The cubic root of 166402257 is about 550.0300336216.

The spelling of 166402257 in words is "one hundred sixty-six million, four hundred two thousand, two hundred fifty-seven".