26401663838 has 16 divisors (see below), whose sum is σ = 43233006960. Its totient is φ = 11992344000.

The previous prime is 26401663837. The next prime is 26401663877. The reversal of 26401663838 is 83836610462.

It is a junction number, because it is equal to n+sod(n) for n = 26401663792 and 26401663801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26401663837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388463 + ... + 451338.

It is an arithmetic number, because the mean of its divisors is an integer number (2702062935).

Almost surely, 2^26401663838 is an apocalyptic number.

26401663838 is a deficient number, since it is larger than the sum of its proper divisors (16831343122).

26401663838 is a wasteful number, since it uses less digits than its factorization.

26401663838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841243.

The product of its (nonzero) digits is 995328, while the sum is 47.

The spelling of 26401663838 in words is "twenty-six billion, four hundred one million, six hundred sixty-three thousand, eight hundred thirty-eight".