26691835861 has 4 divisors (see below), whose sum is σ = 26692162924. Its totient is φ = 26691508800.

The previous prime is 26691835837. The next prime is 26691835879. The reversal of 26691835861 is 16853819662.

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 2 ways, for example, as 509359761 + 26182476100 = 22569^2 + 161810^2 .

It is a cyclic number.

It is not a de Polignac number, because 26691835861 - 2⁷ = 26691835733 is a prime.

It is a super-2 number, since 2×26691835861² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26691835831) 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, 71101 + ... + 241741.

It is an arithmetic number, because the mean of its divisors is an integer number (6673040731).

Almost surely, 2^26691835861 is an apocalyptic number.

It is an amenable number.

26691835861 is a deficient number, since it is larger than the sum of its proper divisors (327063).

26691835861 is a wasteful number, since it uses less digits than its factorization.

26691835861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327062.

The product of its digits is 3732480, while the sum is 55.

The spelling of 26691835861 in words is "twenty-six billion, six hundred ninety-one million, eight hundred thirty-five thousand, eight hundred sixty-one".