2564164646 has 16 divisors (see below), whose sum is σ = 4115056560. Its totient is φ = 1194691680.

The previous prime is 2564164643. The next prime is 2564164657. The reversal of 2564164646 is 6464614652.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2564164597 and 2564164606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564164643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 550781 + ... + 555416.

It is an arithmetic number, because the mean of its divisors is an integer number (257191035).

Almost surely, 2^2564164646 is an apocalyptic number.

2564164646 is a deficient number, since it is larger than the sum of its proper divisors (1550891914).

2564164646 is a wasteful number, since it uses less digits than its factorization.

2564164646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106279.

The product of its digits is 829440, while the sum is 44.

The square root of 2564164646 is about 50637.5813600926. The cubic root of 2564164646 is about 1368.7221725722.

The spelling of 2564164646 in words is "two billion, five hundred sixty-four million, one hundred sixty-four thousand, six hundred forty-six".