666021662 has 4 divisors (see below), whose sum is σ = 999032496. Its totient is φ = 333010830.

The previous prime is 666021659. The next prime is 666021667. The reversal of 666021662 is 266120666.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666021667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166505414 + ... + 166505417.

It is an arithmetic number, because the mean of its divisors is an integer number (249758124).

Almost surely, 2^666021662 is an apocalyptic number.

666021662 is a deficient number, since it is larger than the sum of its proper divisors (333010834).

666021662 is a wasteful number, since it uses less digits than its factorization.

666021662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333010833.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 666021662 is about 25807.3954904403. The cubic root of 666021662 is about 873.2986420901.

The spelling of 666021662 in words is "six hundred sixty-six million, twenty-one thousand, six hundred sixty-two".