641819563 has 16 divisors (see below), whose sum is σ = 842307840. Its totient is φ = 473796000.

The previous prime is 641819557. The next prime is 641819587. The reversal of 641819563 is 365918146.

It is a cyclic number.

It is not a de Polignac number, because 641819563 - 2¹⁷ = 641688491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641819543) 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, 217888 + ... + 220813.

It is an arithmetic number, because the mean of its divisors is an integer number (52644240).

Almost surely, 2^641819563 is an apocalyptic number.

641819563 is a deficient number, since it is larger than the sum of its proper divisors (200488277).

641819563 is a wasteful number, since it uses less digits than its factorization.

641819563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438738.

The product of its digits is 155520, while the sum is 43.

The square root of 641819563 is about 25334.1580282432. The cubic root of 641819563 is about 862.5897969379.

The spelling of 641819563 in words is "six hundred forty-one million, eight hundred nineteen thousand, five hundred sixty-three".