26628350381 has 2 divisors, whose sum is σ = 26628350382. Its totient is φ = 26628350380.

The previous prime is 26628350351. The next prime is 26628350429. The reversal of 26628350381 is 18305382662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23541992356 + 3086358025 = 153434^2 + 55555^2 .

It is a cyclic number.

It is not a de Polignac number, because 26628350381 - 2¹⁸ = 26628088237 is a prime.

It is a super-2 number, since 2×26628350381² (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 (26628350321) 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, 13314175190 + 13314175191.

It is an arithmetic number, because the mean of its divisors is an integer number (13314175191).

Almost surely, 2^26628350381 is an apocalyptic number.

It is an amenable number.

26628350381 is a deficient number, since it is larger than the sum of its proper divisors (1).

26628350381 is an equidigital number, since it uses as much as digits as its factorization.

26628350381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 26628350381 in words is "twenty-six billion, six hundred twenty-eight million, three hundred fifty thousand, three hundred eighty-one".