26564993550 has 48 divisors (see below), whose sum is σ = 73201319280. Its totient is φ = 7083997920.

The previous prime is 26564993527. The next prime is 26564993591. The reversal of 26564993550 is 5539946562.

It is a happy number.

26564993550 is a `hidden beast` number, since 26 + 5 + 64 + 9 + 9 + 3 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 23 ways as a sum of consecutive naturals, for example, 9837537 + ... + 9840236.

It is an arithmetic number, because the mean of its divisors is an integer number (1525027485).

Almost surely, 2^26564993550 is an apocalyptic number.

26564993550 is an abundant number, since it is smaller than the sum of its proper divisors (46636325730).

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

26564993550 is a wasteful number, since it uses less digits than its factorization.

26564993550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19677794 (or 19677783 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 54.

The spelling of 26564993550 in words is "twenty-six billion, five hundred sixty-four million, nine hundred ninety-three thousand, five hundred fifty".