26257812401 has 4 divisors (see below), whose sum is σ = 26688268404. Its totient is φ = 25827356400.

The previous prime is 26257812389. The next prime is 26257812407. The reversal of 26257812401 is 10421875262.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1206520225 + 25051292176 = 34735^2 + 158276^2 .

It is a cyclic number.

It is not a de Polignac number, because 26257812401 - 2¹⁸ = 26257550257 is a prime.

It is a super-2 number, since 2×26257812401² (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 (26257812407) 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, 215227910 + ... + 215228031.

It is an arithmetic number, because the mean of its divisors is an integer number (6672067101).

Almost surely, 2^26257812401 is an apocalyptic number.

It is an amenable number.

26257812401 is a deficient number, since it is larger than the sum of its proper divisors (430456003).

26257812401 is an equidigital number, since it uses as much as digits as its factorization.

26257812401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430456002.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 26257812401 in words is "twenty-six billion, two hundred fifty-seven million, eight hundred twelve thousand, four hundred one".