26564365500 has 144 divisors (see below), whose sum is σ = 81642716064. Its totient is φ = 6710860800.

The previous prime is 26564365493. The next prime is 26564365501. The reversal of 26564365500 is 556346562.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26564365501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 516972 + ... + 566028.

It is an arithmetic number, because the mean of its divisors is an integer number (566963306).

Almost surely, 2^26564365500 is an apocalyptic number.

26564365500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26564365500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40821358032).

26564365500 is an abundant number, since it is smaller than the sum of its proper divisors (55078350564).

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

26564365500 is a wasteful number, since it uses less digits than its factorization.

26564365500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49117 (or 49086 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 26564365500 in words is "twenty-six billion, five hundred sixty-four million, three hundred sixty-five thousand, five hundred".