26691456287 has 2 divisors, whose sum is σ = 26691456288. Its totient is φ = 26691456286.

The previous prime is 26691456283. The next prime is 26691456331. The reversal of 26691456287 is 78265419662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26691456287 - 2² = 26691456283 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26691456283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13345728143 + 13345728144.

It is an arithmetic number, because the mean of its divisors is an integer number (13345728144).

Almost surely, 2^26691456287 is an apocalyptic number.

26691456287 is a deficient number, since it is larger than the sum of its proper divisors (1).

26691456287 is an equidigital number, since it uses as much as digits as its factorization.

26691456287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 56.

It can be divided in two parts, 266 and 91456287, that multiplied together give a palindrome (24327372342).

The spelling of 26691456287 in words is "twenty-six billion, six hundred ninety-one million, four hundred fifty-six thousand, two hundred eighty-seven".