2561765336 has 32 divisors (see below), whose sum is σ = 5182833600. Its totient is φ = 1180058880.

The previous prime is 2561765317. The next prime is 2561765341. The reversal of 2561765336 is 6335671652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30545 + ... + 77823.

It is an arithmetic number, because the mean of its divisors is an integer number (161963550).

Almost surely, 2^2561765336 is an apocalyptic number.

2561765336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2561765336 is an abundant number, since it is smaller than the sum of its proper divisors (2621068264).

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

2561765336 is a wasteful number, since it uses less digits than its factorization.

2561765336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47819 (or 47815 counting only the distinct ones).

The product of its digits is 680400, while the sum is 44.

The square root of 2561765336 is about 50613.8848143471. The cubic root of 2561765336 is about 1368.2951311419.

The spelling of 2561765336 in words is "two billion, five hundred sixty-one million, seven hundred sixty-five thousand, three hundred thirty-six".