166247917 has 8 divisors (see below), whose sum is σ = 181763712. Its totient is φ = 150799200.

The previous prime is 166247911. The next prime is 166247969. The reversal of 166247917 is 719742661.

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

It is a cyclic number.

It is not a de Polignac number, because 166247917 - 2²³ = 157859309 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 (166247911) 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, 11509 + ... + 21562.

It is an arithmetic number, because the mean of its divisors is an integer number (22720464).

Almost surely, 2^166247917 is an apocalyptic number.

It is an amenable number.

166247917 is a deficient number, since it is larger than the sum of its proper divisors (15515795).

166247917 is a wasteful number, since it uses less digits than its factorization.

166247917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33539.

The product of its digits is 127008, while the sum is 43.

The square root of 166247917 is about 12893.7161826992. The cubic root of 166247917 is about 549.8599279663.

The spelling of 166247917 in words is "one hundred sixty-six million, two hundred forty-seven thousand, nine hundred seventeen".