26961931781 has 8 divisors (see below), whose sum is σ = 27543694080. Its totient is φ = 26380507248.

The previous prime is 26961931771. The next prime is 26961931807. The reversal of 26961931781 is 18713916962.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26961931781 is a prime.

It is a super-2 number, since 2×26961931781² (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 (26961931751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80360 + ... + 245726.

It is an arithmetic number, because the mean of its divisors is an integer number (3442961760).

Almost surely, 2^26961931781 is an apocalyptic number.

It is an amenable number.

26961931781 is a deficient number, since it is larger than the sum of its proper divisors (581762299).

26961931781 is a wasteful number, since it uses less digits than its factorization.

26961931781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168883.

The product of its digits is 979776, while the sum is 53.

The spelling of 26961931781 in words is "twenty-six billion, nine hundred sixty-one million, nine hundred thirty-one thousand, seven hundred eighty-one".