26312638381 has 2 divisors, whose sum is σ = 26312638382. Its totient is φ = 26312638380.

The previous prime is 26312638349. The next prime is 26312638453. The reversal of 26312638381 is 18383621362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20206622500 + 6106015881 = 142150^2 + 78141^2 .

It is a cyclic number.

It is not a de Polignac number, because 26312638381 - 2⁵ = 26312638349 is a prime.

It is a super-2 number, since 2×26312638381² (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 (26312630381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13156319190 + 13156319191.

It is an arithmetic number, because the mean of its divisors is an integer number (13156319191).

Almost surely, 2^26312638381 is an apocalyptic number.

It is an amenable number.

26312638381 is a deficient number, since it is larger than the sum of its proper divisors (1).

26312638381 is an equidigital number, since it uses as much as digits as its factorization.

26312638381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The spelling of 26312638381 in words is "twenty-six billion, three hundred twelve million, six hundred thirty-eight thousand, three hundred eighty-one".