26318447381 has 2 divisors, whose sum is σ = 26318447382. Its totient is φ = 26318447380.

The previous prime is 26318447333. The next prime is 26318447413. The reversal of 26318447381 is 18374481362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25814848900 + 503598481 = 160670^2 + 22441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26318447381 is a prime.

It is a super-2 number, since 2×26318447381² (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 (26318447581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13159223690 + 13159223691.

It is an arithmetic number, because the mean of its divisors is an integer number (13159223691).

Almost surely, 2^26318447381 is an apocalyptic number.

It is an amenable number.

26318447381 is a deficient number, since it is larger than the sum of its proper divisors (1).

26318447381 is an equidigital number, since it uses as much as digits as its factorization.

26318447381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 47.

The spelling of 26318447381 in words is "twenty-six billion, three hundred eighteen million, four hundred forty-seven thousand, three hundred eighty-one".