8157666 has 16 divisors (see below), whose sum is σ = 17798688. Its totient is φ = 2472000.

The previous prime is 8157641. The next prime is 8157673. The reversal of 8157666 is 6667518.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61735 + ... + 61866.

It is an arithmetic number, because the mean of its divisors is an integer number (1112418).

Almost surely, 2^8157666 is an apocalyptic number.

8157666 is an abundant number, since it is smaller than the sum of its proper divisors (9641022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8157666 is a wasteful number, since it uses less digits than its factorization.

8157666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123617.

The product of its digits is 60480, while the sum is 39.

The square root of 8157666 is about 2856.1628104854. The cubic root of 8157666 is about 201.3053451682.

The spelling of 8157666 in words is "eight million, one hundred fifty-seven thousand, six hundred sixty-six".