26951691161 has 6 divisors (see below), whose sum is σ = 27610126362. Its totient is φ = 26293307280.

The previous prime is 26951691131. The next prime is 26951691209. The reversal of 26951691161 is 16119615962.

It can be written as a sum of positive squares in only one way, i.e., 16433958025 + 10517733136 = 128195^2 + 102556^2 .

It is not a de Polignac number, because 26951691161 - 2⁶ = 26951691097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26951691131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1038380 + ... + 1064018.

It is an arithmetic number, because the mean of its divisors is an integer number (4601687727).

Almost surely, 2^26951691161 is an apocalyptic number.

It is an amenable number.

26951691161 is a deficient number, since it is larger than the sum of its proper divisors (658435201).

26951691161 is an frugal number, since it uses more digits than its factorization.

26951691161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51319 (or 25680 counting only the distinct ones).

The product of its digits is 174960, while the sum is 47.

The spelling of 26951691161 in words is "twenty-six billion, nine hundred fifty-one million, six hundred ninety-one thousand, one hundred sixty-one".