26440202639 has 4 divisors (see below), whose sum is σ = 26441834856. Its totient is φ = 26438570424.

The previous prime is 26440202599. The next prime is 26440202651. The reversal of 26440202639 is 93620204462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93620204462 = 2 ⋅46810102231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26440202639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26440202669) 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, 791564 + ... + 824289.

It is an arithmetic number, because the mean of its divisors is an integer number (6610458714).

Almost surely, 2^26440202639 is an apocalyptic number.

26440202639 is a deficient number, since it is larger than the sum of its proper divisors (1632217).

26440202639 is a wasteful number, since it uses less digits than its factorization.

26440202639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632216.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 26440202639 in words is "twenty-six billion, four hundred forty million, two hundred two thousand, six hundred thirty-nine".