26564163644 has 24 divisors (see below), whose sum is σ = 49553414400. Its totient is φ = 12423743280.

The previous prime is 26564163623. The next prime is 26564163677. The reversal of 26564163644 is 44636146562.

It is a super-2 number, since 2×26564163644² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2206202 + ... + 2218209.

It is an arithmetic number, because the mean of its divisors is an integer number (2064725600).

Almost surely, 2^26564163644 is an apocalyptic number.

It is an amenable number.

26564163644 is a deficient number, since it is larger than the sum of its proper divisors (22989250756).

26564163644 is a wasteful number, since it uses less digits than its factorization.

26564163644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424513 (or 4424511 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 47.

The spelling of 26564163644 in words is "twenty-six billion, five hundred sixty-four million, one hundred sixty-three thousand, six hundred forty-four".