26698778719 has 2 divisors, whose sum is σ = 26698778720. Its totient is φ = 26698778718.

The previous prime is 26698778699. The next prime is 26698778723. The reversal of 26698778719 is 91787789662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26698778719 - 2¹⁹ = 26698254431 is a prime.

It is a super-2 number, since 2×26698778719² (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 (26698778759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13349389359 + 13349389360.

It is an arithmetic number, because the mean of its divisors is an integer number (13349389360).

Almost surely, 2^26698778719 is an apocalyptic number.

26698778719 is a deficient number, since it is larger than the sum of its proper divisors (1).

26698778719 is an equidigital number, since it uses as much as digits as its factorization.

26698778719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128024064, while the sum is 70.

The spelling of 26698778719 in words is "twenty-six billion, six hundred ninety-eight million, seven hundred seventy-eight thousand, seven hundred nineteen".