8019666 has 12 divisors (see below), whose sum is σ = 17375982. Its totient is φ = 2673216.

The previous prime is 8019647. The next prime is 8019667. The reversal of 8019666 is 6669108.

It can be written as a sum of positive squares in only one way, i.e., 5832225 + 2187441 = 2415^2 + 1479^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 8019666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8019667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 222751 + ... + 222786.

Almost surely, 2^8019666 is an apocalyptic number.

8019666 is an abundant number, since it is smaller than the sum of its proper divisors (9356316).

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

8019666 is a wasteful number, since it uses less digits than its factorization.

8019666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445545 (or 445542 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 8019666 is about 2831.9014813372. The cubic root of 8019666 is about 200.1637492277.

The spelling of 8019666 in words is "eight million, nineteen thousand, six hundred sixty-six".