26251441981 has 4 divisors (see below), whose sum is σ = 26336951872. Its totient is φ = 26165932092.

The previous prime is 26251441969. The next prime is 26251441991. The reversal of 26251441981 is 18914415262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26251441981 - 2³³ = 17661507389 is a prime.

It is a super-2 number, since 2×26251441981² (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 (26251441961) 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, 42754485 + ... + 42755098.

It is an arithmetic number, because the mean of its divisors is an integer number (6584237968).

Almost surely, 2^26251441981 is an apocalyptic number.

It is an amenable number.

26251441981 is a deficient number, since it is larger than the sum of its proper divisors (85509891).

26251441981 is an equidigital number, since it uses as much as digits as its factorization.

26251441981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85509890.

The product of its digits is 138240, while the sum is 43.

The spelling of 26251441981 in words is "twenty-six billion, two hundred fifty-one million, four hundred forty-one thousand, nine hundred eighty-one".