26805545643 has 4 divisors (see below), whose sum is σ = 35740727528. Its totient is φ = 17870363760.

The previous prime is 26805545639. The next prime is 26805545653. The reversal of 26805545643 is 34654550862.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 26805545643 - 2² = 26805545639 is a prime.

It is a super-4 number, since 4×26805545643⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26805545592 and 26805545601.

It is not an unprimeable number, because it can be changed into a prime (26805545653) 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, 4467590938 + ... + 4467590943.

It is an arithmetic number, because the mean of its divisors is an integer number (8935181882).

Almost surely, 2^26805545643 is an apocalyptic number.

26805545643 is a deficient number, since it is larger than the sum of its proper divisors (8935181885).

26805545643 is an equidigital number, since it uses as much as digits as its factorization.

26805545643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8935181884.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 26805545643 in words is "twenty-six billion, eight hundred five million, five hundred forty-five thousand, six hundred forty-three".