26643949919 has 4 divisors (see below), whose sum is σ = 26646941496. Its totient is φ = 26640958344.

The previous prime is 26643949909. The next prime is 26643949933. The reversal of 26643949919 is 91994934662.

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

It is a cyclic number.

It is not a de Polignac number, because 26643949919 - 2⁸ = 26643949663 is a prime.

It is a super-2 number, since 2×26643949919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26643949909) 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, 1482389 + ... + 1500254.

It is an arithmetic number, because the mean of its divisors is an integer number (6661735374).

Almost surely, 2^26643949919 is an apocalyptic number.

26643949919 is a deficient number, since it is larger than the sum of its proper divisors (2991577).

26643949919 is an equidigital number, since it uses as much as digits as its factorization.

26643949919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991576.

The product of its digits is 22674816, while the sum is 62.

The spelling of 26643949919 in words is "twenty-six billion, six hundred forty-three million, nine hundred forty-nine thousand, nine hundred nineteen".