166117357 has 4 divisors (see below), whose sum is σ = 189848416. Its totient is φ = 142386300.

The previous prime is 166117349. The next prime is 166117379. The reversal of 166117357 is 753711661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 753711661 = 821 ⋅918041.

It is not a de Polignac number, because 166117357 - 2³ = 166117349 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 (166117337) 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, 11865519 + ... + 11865532.

It is an arithmetic number, because the mean of its divisors is an integer number (47462104).

Almost surely, 2^166117357 is an apocalyptic number.

It is an amenable number.

166117357 is a deficient number, since it is larger than the sum of its proper divisors (23731059).

166117357 is an equidigital number, since it uses as much as digits as its factorization.

166117357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23731058.

The product of its digits is 26460, while the sum is 37.

The square root of 166117357 is about 12888.6522569274. The cubic root of 166117357 is about 549.7159491933.

The spelling of 166117357 in words is "one hundred sixty-six million, one hundred seventeen thousand, three hundred fifty-seven".