2564649956 has 12 divisors (see below), whose sum is σ = 4896150000. Its totient is φ = 1165749960.

The previous prime is 2564649947. The next prime is 2564649959. The reversal of 2564649956 is 6599464652.

It is a happy number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2564649959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29143706 + ... + 29143793.

It is an arithmetic number, because the mean of its divisors is an integer number (408012500).

Almost surely, 2^2564649956 is an apocalyptic number.

It is an amenable number.

2564649956 is a deficient number, since it is larger than the sum of its proper divisors (2331500044).

2564649956 is a wasteful number, since it uses less digits than its factorization.

2564649956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58287514 (or 58287512 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 56.

The square root of 2564649956 is about 50642.3731276487. The cubic root of 2564649956 is about 1368.8085181267.

The spelling of 2564649956 in words is "two billion, five hundred sixty-four million, six hundred forty-nine thousand, nine hundred fifty-six".