2561663432 has 16 divisors (see below), whose sum is σ = 4805041500. Its totient is φ = 1280319040.

The previous prime is 2561663431. The next prime is 2561663441. The reversal of 2561663432 is 2343661652.

It is a happy number.

2561663432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2507405476 + 54257956 = 50074^2 + 7366^2 .

It is not an unprimeable number, because it can be changed into a prime (2561663431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42419 + ... + 83202.

Almost surely, 2^2561663432 is an apocalyptic number.

It is an amenable number.

2561663432 is a deficient number, since it is larger than the sum of its proper divisors (2243378068).

2561663432 is a wasteful number, since it uses less digits than its factorization.

2561663432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128176 (or 128172 counting only the distinct ones).

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

The square root of 2561663432 is about 50612.8781240506. The cubic root of 2561663432 is about 1368.2769878464.

The spelling of 2561663432 in words is "two billion, five hundred sixty-one million, six hundred sixty-three thousand, four hundred thirty-two".