26889768361 has 3 divisors (see below), whose sum is σ = 26889932343. Its totient is φ = 26889604380.

The previous prime is 26889768337. The next prime is 26889768419. The reversal of 26889768361 is 16386798862.

The square root of 26889768361 is 163981.

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., 19661367961 + 7228400400 = 140219^2 + 85020^2 .

It is not a de Polignac number, because 26889768361 - 2²³ = 26881379753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26889768293 and 26889768302.

It is not an unprimeable number, because it can be changed into a prime (26889768331) 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, 81991 + ... + 245971.

It is an arithmetic number, because the mean of its divisors is an integer number (8963310781).

Almost surely, 2^26889768361 is an apocalyptic number.

26889768361 is the 163981-st square number.

26889768361 is the 81991-st centered octagonal number.

It is an amenable number.

26889768361 is a deficient number, since it is larger than the sum of its proper divisors (163982).

26889768361 is an frugal number, since it uses more digits than its factorization.

26889768361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327962 (or 163981 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 64.

Multiplying 26889768361 by its sum of digits (64), we get a square (1720945175104 = 1311848²).

The spelling of 26889768361 in words is "twenty-six billion, eight hundred eighty-nine million, seven hundred sixty-eight thousand, three hundred sixty-one".