26401663877 has 2 divisors, whose sum is σ = 26401663878. Its totient is φ = 26401663876.

The previous prime is 26401663837. The next prime is 26401663879. The reversal of 26401663877 is 77836610462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13370528161 + 13031135716 = 115631^2 + 114154^2 .

It is a cyclic number.

It is not a de Polignac number, because 26401663877 - 2³² = 22106696581 is a prime.

It is a super-2 number, since 2×26401663877² (a number of 22 digits) contains 22 as substring.

Together with 26401663879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26401663879) 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, 13200831938 + 13200831939.

It is an arithmetic number, because the mean of its divisors is an integer number (13200831939).

Almost surely, 2^26401663877 is an apocalyptic number.

It is an amenable number.

26401663877 is a deficient number, since it is larger than the sum of its proper divisors (1).

26401663877 is an equidigital number, since it uses as much as digits as its factorization.

26401663877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 26401663877 in words is "twenty-six billion, four hundred one million, six hundred sixty-three thousand, eight hundred seventy-seven".