2561899772 has 24 divisors (see below), whose sum is σ = 4513913712. Its totient is φ = 1272240000.

The previous prime is 2561899757. The next prime is 2561899783. The reversal of 2561899772 is 2779981652.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371072 + ... + 377912.

It is an arithmetic number, because the mean of its divisors is an integer number (188079738).

Almost surely, 2^2561899772 is an apocalyptic number.

It is an amenable number.

2561899772 is a deficient number, since it is larger than the sum of its proper divisors (1952013940).

2561899772 is a wasteful number, since it uses less digits than its factorization.

2561899772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7469 (or 7467 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 56.

The square root of 2561899772 is about 50615.2128514738. The cubic root of 2561899772 is about 1368.3190657966.

The spelling of 2561899772 in words is "two billion, five hundred sixty-one million, eight hundred ninety-nine thousand, seven hundred seventy-two".