26581842587 has 4 divisors (see below), whose sum is σ = 26584283976. Its totient is φ = 26579401200.

The previous prime is 26581842559. The next prime is 26581842611. The reversal of 26581842587 is 78524818562.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26581842587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26581842557) 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, 1204289 + ... + 1226162.

It is an arithmetic number, because the mean of its divisors is an integer number (6646070994).

Almost surely, 2^26581842587 is an apocalyptic number.

26581842587 is a deficient number, since it is larger than the sum of its proper divisors (2441389).

26581842587 is a wasteful number, since it uses less digits than its factorization.

26581842587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441388.

The product of its digits is 8601600, while the sum is 56.

The spelling of 26581842587 in words is "twenty-six billion, five hundred eighty-one million, eight hundred forty-two thousand, five hundred eighty-seven".