26973651643 has 2 divisors, whose sum is σ = 26973651644. Its totient is φ = 26973651642.

The previous prime is 26973651623. The next prime is 26973651697. The reversal of 26973651643 is 34615637962.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26973651643 - 2⁵ = 26973651611 is a prime.

It is not a weakly prime, because it can be changed into another prime (26973651623) 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, 13486825821 + 13486825822.

It is an arithmetic number, because the mean of its divisors is an integer number (13486825822).

Almost surely, 2^26973651643 is an apocalyptic number.

26973651643 is a deficient number, since it is larger than the sum of its proper divisors (1).

26973651643 is an equidigital number, since it uses as much as digits as its factorization.

26973651643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 52.

The spelling of 26973651643 in words is "twenty-six billion, nine hundred seventy-three million, six hundred fifty-one thousand, six hundred forty-three".