2561402616 has 64 divisors (see below), whose sum is σ = 6884006400. Its totient is φ = 791647488.

The previous prime is 2561402609. The next prime is 2561402633. The reversal of 2561402616 is 6162041652.

It is a super-2 number, since 2×2561402616² = 13121566722503286912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38325 + ... + 81188.

It is an arithmetic number, because the mean of its divisors is an integer number (107562600).

Almost surely, 2^2561402616 is an apocalyptic number.

It is an amenable number.

2561402616 is an abundant number, since it is smaller than the sum of its proper divisors (4322603784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561402616 is a wasteful number, since it uses less digits than its factorization.

2561402616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119588 (or 119584 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2561402616 is about 50610.3014810226. The cubic root of 2561402616 is about 1368.2305491875.

The spelling of 2561402616 in words is "two billion, five hundred sixty-one million, four hundred two thousand, six hundred sixteen".