2561651102 has 4 divisors (see below), whose sum is σ = 3842476656. Its totient is φ = 1280825550.

The previous prime is 2561651047. The next prime is 2561651111. The reversal of 2561651102 is 2011561652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640412774 + ... + 640412777.

It is an arithmetic number, because the mean of its divisors is an integer number (960619164).

Almost surely, 2^2561651102 is an apocalyptic number.

2561651102 is a deficient number, since it is larger than the sum of its proper divisors (1280825554).

2561651102 is a wasteful number, since it uses less digits than its factorization.

2561651102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280825553.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 2561651102 is about 50612.7563169603. The cubic root of 2561651102 is about 1368.2747925434.

The spelling of 2561651102 in words is "two billion, five hundred sixty-one million, six hundred fifty-one thousand, one hundred two".