166648857 has 8 divisors (see below), whose sum is σ = 225328320. Its totient is φ = 109534320.

The previous prime is 166648843. The next prime is 166648871. The reversal of 166648857 is 758846661.

It is an interprime number because it is at equal distance from previous prime (166648843) and next prime (166648871).

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

It is not a de Polignac number, because 166648857 - 2¹⁶ = 166583321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166648817) 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, 390982 + ... + 391407.

It is an arithmetic number, because the mean of its divisors is an integer number (28166040).

Almost surely, 2^166648857 is an apocalyptic number.

It is an amenable number.

166648857 is a deficient number, since it is larger than the sum of its proper divisors (58679463).

166648857 is an equidigital number, since it uses as much as digits as its factorization.

166648857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782463.

The product of its digits is 1935360, while the sum is 51.

The square root of 166648857 is about 12909.2547035063. The cubic root of 166648857 is about 550.3016053763.

The spelling of 166648857 in words is "one hundred sixty-six million, six hundred forty-eight thousand, eight hundred fifty-seven".