26340443643 has 4 divisors (see below), whose sum is σ = 35120591528. Its totient is φ = 17560295760.

The previous prime is 26340443629. The next prime is 26340443677. The reversal of 26340443643 is 34634404362.

It is a happy number.

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

It is not a de Polignac number, because 26340443643 - 2²² = 26336249339 is a prime.

It is a super-2 number, since 2×26340443643² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26340443243) 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, 4390073938 + ... + 4390073943.

It is an arithmetic number, because the mean of its divisors is an integer number (8780147882).

Almost surely, 2^26340443643 is an apocalyptic number.

26340443643 is a deficient number, since it is larger than the sum of its proper divisors (8780147885).

26340443643 is an equidigital number, since it uses as much as digits as its factorization.

26340443643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8780147884.

The product of its (nonzero) digits is 497664, while the sum is 39.

The spelling of 26340443643 in words is "twenty-six billion, three hundred forty million, four hundred forty-three thousand, six hundred forty-three".