26691456331 has 2 divisors, whose sum is σ = 26691456332. Its totient is φ = 26691456330.

The previous prime is 26691456287. The next prime is 26691456343. The reversal of 26691456331 is 13365419662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26691456331 is a prime.

It is a super-2 number, since 2×26691456331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26691456391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13345728165 + 13345728166.

It is an arithmetic number, because the mean of its divisors is an integer number (13345728166).

Almost surely, 2^26691456331 is an apocalyptic number.

26691456331 is a deficient number, since it is larger than the sum of its proper divisors (1).

26691456331 is an equidigital number, since it uses as much as digits as its factorization.

26691456331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 46.

The spelling of 26691456331 in words is "twenty-six billion, six hundred ninety-one million, four hundred fifty-six thousand, three hundred thirty-one".