2561772644 has 12 divisors (see below), whose sum is σ = 4587360624. Its totient is φ = 1251098184.

The previous prime is 2561772617. The next prime is 2561772677. The reversal of 2561772644 is 4462771652.

It is a happy number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2561772595 and 2561772604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7446842 + ... + 7447185.

It is an arithmetic number, because the mean of its divisors is an integer number (382280052).

Almost surely, 2^2561772644 is an apocalyptic number.

It is an amenable number.

2561772644 is a deficient number, since it is larger than the sum of its proper divisors (2025587980).

2561772644 is a wasteful number, since it uses less digits than its factorization.

2561772644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14894074 (or 14894072 counting only the distinct ones).

The product of its digits is 564480, while the sum is 44.

The square root of 2561772644 is about 50613.9570079242. The cubic root of 2561772644 is about 1368.2964322617.

The spelling of 2561772644 in words is "two billion, five hundred sixty-one million, seven hundred seventy-two thousand, six hundred forty-four".