2561641612 has 6 divisors (see below), whose sum is σ = 4482872828. Its totient is φ = 1280820804.

The previous prime is 2561641603. The next prime is 2561641657. The reversal of 2561641612 is 2161461652.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320205198 + ... + 320205205.

Almost surely, 2^2561641612 is an apocalyptic number.

It is an amenable number.

2561641612 is a deficient number, since it is larger than the sum of its proper divisors (1921231216).

2561641612 is a wasteful number, since it uses less digits than its factorization.

2561641612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640410407 (or 640410405 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 2561641612 is about 50612.6625658046. The cubic root of 2561641612 is about 1368.2731028853.

The spelling of 2561641612 in words is "two billion, five hundred sixty-one million, six hundred forty-one thousand, six hundred twelve".