26127812881 has 3 divisors (see below), whose sum is σ = 26127974523. Its totient is φ = 26127651240.

The previous prime is 26127812831. The next prime is 26127812899. The reversal of 26127812881 is 18821872162.

The square root of 26127812881 is 161641.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 9517758481 + 16610054400 = 97559^2 + 128880^2 .

It is not a de Polignac number, because 26127812881 - 2²¹ = 26125715729 is a prime.

It is a super-2 number, since 2×26127812881² (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 (26127812831) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 80821 + ... + 242461.

It is an arithmetic number, because the mean of its divisors is an integer number (8709324841).

Almost surely, 2^26127812881 is an apocalyptic number.

26127812881 is the 161641-st square number.

26127812881 is the 80821-st centered octagonal number.

It is an amenable number.

26127812881 is a deficient number, since it is larger than the sum of its proper divisors (161642).

26127812881 is an frugal number, since it uses more digits than its factorization.

26127812881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323282 (or 161641 counting only the distinct ones).

The product of its digits is 172032, while the sum is 46.

The spelling of 26127812881 in words is "twenty-six billion, one hundred twenty-seven million, eight hundred twelve thousand, eight hundred eighty-one".