641345663 has 12 divisors (see below), whose sum is σ = 746516232. Its totient is φ = 549385200.

The previous prime is 641345647. The next prime is 641345669. The reversal of 641345663 is 366543146.

It is not a de Polignac number, because 641345663 - 2⁴ = 641345647 is a prime.

It is a super-2 number, since 2×641345663² = 822648518897819138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641345669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106688 + ... + 112538.

It is an arithmetic number, because the mean of its divisors is an integer number (62209686).

Almost surely, 2^641345663 is an apocalyptic number.

641345663 is a deficient number, since it is larger than the sum of its proper divisors (105170569).

641345663 is a wasteful number, since it uses less digits than its factorization.

641345663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8102 (or 8095 counting only the distinct ones).

The product of its digits is 155520, while the sum is 38.

The square root of 641345663 is about 25324.8033161168. The cubic root of 641345663 is about 862.3774413268.

The spelling of 641345663 in words is "six hundred forty-one million, three hundred forty-five thousand, six hundred sixty-three".