641666883 has 16 divisors (see below), whose sum is σ = 1005129216. Its totient is φ = 358974240.

The previous prime is 641666881. The next prime is 641666897. The reversal of 641666883 is 388666146.

It is not a de Polignac number, because 641666883 - 2¹ = 641666881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641666881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 747435 + ... + 748292.

It is an arithmetic number, because the mean of its divisors is an integer number (62820576).

Almost surely, 2^641666883 is an apocalyptic number.

641666883 is a deficient number, since it is larger than the sum of its proper divisors (363462333).

641666883 is a wasteful number, since it uses less digits than its factorization.

641666883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495754.

The product of its digits is 995328, while the sum is 48.

The square root of 641666883 is about 25331.1445260572. The cubic root of 641666883 is about 862.5213921180.

The spelling of 641666883 in words is "six hundred forty-one million, six hundred sixty-six thousand, eight hundred eighty-three".