26444939161 has 9 divisors (see below), whose sum is σ = 26661838399. Its totient is φ = 26229794224.

The previous prime is 26444939141. The next prime is 26444939239. The reversal of 26444939161 is 16193944462.

The square root of 26444939161 is 162619.

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

It can be written as a sum of positive squares in only one way, i.e., 15533883225 + 10911055936 = 124635^2 + 104456^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26444939161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26444939141) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22278210 + ... + 22279396.

Almost surely, 2^26444939161 is an apocalyptic number.

26444939161 is the 162619-th square number.

26444939161 is the 81310-th centered octagonal number.

It is an amenable number.

26444939161 is a deficient number, since it is larger than the sum of its proper divisors (216899238).

26444939161 is an frugal number, since it uses more digits than its factorization.

26444939161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648 (or 1324 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

Multiplying 26444939161 by its sum of digits (49), we get a square (1295802018889 = 1138333²).

The spelling of 26444939161 in words is "twenty-six billion, four hundred forty-four million, nine hundred thirty-nine thousand, one hundred sixty-one".