641602863 has 36 divisors (see below), whose sum is σ = 1056446664. Its totient is φ = 388832400.

The previous prime is 641602853. The next prime is 641602867. The reversal of 641602863 is 368206146.

641602863 is a `hidden beast` number, since 6 + 41 + 602 + 8 + 6 + 3 = 666.

It is not a de Polignac number, because 641602863 - 2⁴ = 641602847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641602867) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18493 + ... + 40313.

Almost surely, 2^641602863 is an apocalyptic number.

641602863 is a deficient number, since it is larger than the sum of its proper divisors (414843801).

641602863 is a wasteful number, since it uses less digits than its factorization.

641602863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21858 (or 21835 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 641602863 is about 25329.8808327240. The cubic root of 641602863 is about 862.4927061765.

The spelling of 641602863 in words is "six hundred forty-one million, six hundred two thousand, eight hundred sixty-three".