26669191687 has 2 divisors, whose sum is σ = 26669191688. Its totient is φ = 26669191686.

The previous prime is 26669191669. The next prime is 26669191693. The reversal of 26669191687 is 78619196662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26669191687 - 2¹¹ = 26669189639 is a prime.

It is a super-2 number, since 2×26669191687² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26669191657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13334595843 + 13334595844.

It is an arithmetic number, because the mean of its divisors is an integer number (13334595844).

Almost surely, 2^26669191687 is an apocalyptic number.

26669191687 is a deficient number, since it is larger than the sum of its proper divisors (1).

26669191687 is an equidigital number, since it uses as much as digits as its factorization.

26669191687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 61.

The spelling of 26669191687 in words is "twenty-six billion, six hundred sixty-nine million, one hundred ninety-one thousand, six hundred eighty-seven".