641938563 has 60 divisors (see below), whose sum is σ = 1101711728. Its totient is φ = 360067680.

The previous prime is 641938559. The next prime is 641938573. The reversal of 641938563 is 365839146.

It is not a de Polignac number, because 641938563 - 2² = 641938559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641938573) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1317906 + ... + 1318392.

Almost surely, 2^641938563 is an apocalyptic number.

641938563 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

641938563 is a deficient number, since it is larger than the sum of its proper divisors (459773165).

641938563 is an equidigital number, since it uses as much as digits as its factorization.

641938563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 558 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 641938563 is about 25336.5065271438. The cubic root of 641938563 is about 862.6431046734.

The spelling of 641938563 in words is "six hundred forty-one million, nine hundred thirty-eight thousand, five hundred sixty-three".