26310781819 has 6 divisors (see below), whose sum is σ = 30606419724. Its totient is φ = 22552098660.

The previous prime is 26310781813. The next prime is 26310781883. The reversal of 26310781819 is 91818701362.

It is a happy number.

It is not a de Polignac number, because 26310781819 - 2³ = 26310781811 is a prime.

It is a super-2 number, since 2×26310781819² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26310781811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 268477317 + ... + 268477414.

It is an arithmetic number, because the mean of its divisors is an integer number (5101069954).

Almost surely, 2^26310781819 is an apocalyptic number.

26310781819 is a deficient number, since it is larger than the sum of its proper divisors (4295637905).

26310781819 is an equidigital number, since it uses as much as digits as its factorization.

26310781819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536954745 (or 536954738 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 26310781819 in words is "twenty-six billion, three hundred ten million, seven hundred eighty-one thousand, eight hundred nineteen".