641045561 has 24 divisors (see below), whose sum is σ = 711504000. Its totient is φ = 577117632.

The previous prime is 641045557. The next prime is 641045611. The reversal of 641045561 is 165540146.

It is not a de Polignac number, because 641045561 - 2² = 641045557 is a prime.

It is a super-2 number, since 2×641045561² = 821878822555609442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641041561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2382935 + ... + 2383203.

It is an arithmetic number, because the mean of its divisors is an integer number (29646000).

Almost surely, 2^641045561 is an apocalyptic number.

It is an amenable number.

641045561 is a deficient number, since it is larger than the sum of its proper divisors (70458439).

641045561 is a wasteful number, since it uses less digits than its factorization.

641045561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 641045561 is about 25318.8775620089. The cubic root of 641045561 is about 862.2429108716.

The spelling of 641045561 in words is "six hundred forty-one million, forty-five thousand, five hundred sixty-one".