26660285381 has 2 divisors, whose sum is σ = 26660285382. Its totient is φ = 26660285380.

The previous prime is 26660285363. The next prime is 26660285429. The reversal of 26660285381 is 18358206662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24777593281 + 1882692100 = 157409^2 + 43390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26660285381 is a prime.

It is a super-2 number, since 2×26660285381² (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 (26660284381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13330142690 + 13330142691.

It is an arithmetic number, because the mean of its divisors is an integer number (13330142691).

Almost surely, 2^26660285381 is an apocalyptic number.

It is an amenable number.

26660285381 is a deficient number, since it is larger than the sum of its proper divisors (1).

26660285381 is an equidigital number, since it uses as much as digits as its factorization.

26660285381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 26660285381 in words is "twenty-six billion, six hundred sixty million, two hundred eighty-five thousand, three hundred eighty-one".