620205666 has 16 divisors (see below), whose sum is σ = 1260746688. Its totient is φ = 203346000.

The previous prime is 620205653. The next prime is 620205721. The reversal of 620205666 is 666502026.

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, 846910 + ... + 847641.

It is an arithmetic number, because the mean of its divisors is an integer number (78796668).

Almost surely, 2^620205666 is an apocalyptic number.

620205666 is an abundant number, since it is smaller than the sum of its proper divisors (640541022).

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

620205666 is a wasteful number, since it uses less digits than its factorization.

620205666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694617.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 620205666 is about 24903.9287262070. The cubic root of 620205666 is about 852.7961738125.

The spelling of 620205666 in words is "six hundred twenty million, two hundred five thousand, six hundred sixty-six".