26831953661 has 4 divisors (see below), whose sum is σ = 26832735132. Its totient is φ = 26831172192.

The previous prime is 26831953637. The next prime is 26831953667. The reversal of 26831953661 is 16635913862.

It is a happy number.

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 16079508025 + 10752445636 = 126805^2 + 103694^2 .

It is a cyclic number.

It is not a de Polignac number, because 26831953661 - 2⁶ = 26831953597 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 (26831953667) 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, 336746 + ... + 408731.

It is an arithmetic number, because the mean of its divisors is an integer number (6708183783).

Almost surely, 2^26831953661 is an apocalyptic number.

It is an amenable number.

26831953661 is a deficient number, since it is larger than the sum of its proper divisors (781471).

26831953661 is an equidigital number, since it uses as much as digits as its factorization.

26831953661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781470.

The product of its digits is 1399680, while the sum is 50.

The spelling of 26831953661 in words is "twenty-six billion, eight hundred thirty-one million, nine hundred fifty-three thousand, six hundred sixty-one".