2561880634 has 4 divisors (see below), whose sum is σ = 3842820954. Its totient is φ = 1280940316.

The previous prime is 2561880611. The next prime is 2561880661. The reversal of 2561880634 is 4360881652.

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

It can be written as a sum of positive squares in only one way, i.e., 2511513225 + 50367409 = 50115^2 + 7097^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640470157 + ... + 640470160.

Almost surely, 2^2561880634 is an apocalyptic number.

2561880634 is a deficient number, since it is larger than the sum of its proper divisors (1280940320).

2561880634 is a wasteful number, since it uses less digits than its factorization.

2561880634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280940319.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 2561880634 is about 50615.0237972877. The cubic root of 2561880634 is about 1368.3156585653.

The spelling of 2561880634 in words is "two billion, five hundred sixty-one million, eight hundred eighty thousand, six hundred thirty-four".