26430957391 has 2 divisors, whose sum is σ = 26430957392. Its totient is φ = 26430957390.

The previous prime is 26430957389. The next prime is 26430957433. The reversal of 26430957391 is 19375903462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26430957391 - 2¹ = 26430957389 is a prime.

Together with 26430957389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26430952391) 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 as a sum of consecutive naturals, namely, 13215478695 + 13215478696.

It is an arithmetic number, because the mean of its divisors is an integer number (13215478696).

Almost surely, 2^26430957391 is an apocalyptic number.

26430957391 is a deficient number, since it is larger than the sum of its proper divisors (1).

26430957391 is an equidigital number, since it uses as much as digits as its factorization.

26430957391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 26430957391 in words is "twenty-six billion, four hundred thirty million, nine hundred fifty-seven thousand, three hundred ninety-one".