2561102002 has 16 divisors (see below), whose sum is σ = 3862582200. Its totient is φ = 1273592320.

The previous prime is 2561101999. The next prime is 2561102009. The reversal of 2561102002 is 2002011652.

It can be written as a sum of positive squares in 4 ways, for example, as 2150269641 + 410832361 = 46371^2 + 20269^2 .

It is not an unprimeable number, because it can be changed into a prime (2561102009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315774 + ... + 323782.

Almost surely, 2^2561102002 is an apocalyptic number.

2561102002 is a deficient number, since it is larger than the sum of its proper divisors (1301480198).

2561102002 is a wasteful number, since it uses less digits than its factorization.

2561102002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2561102002 is about 50607.3315044372. The cubic root of 2561102002 is about 1368.1770205274.

Adding to 2561102002 its reverse (2002011652), we get a palindrome (4563113654).

The spelling of 2561102002 in words is "two billion, five hundred sixty-one million, one hundred two thousand, two".