26651863688 has 12 divisors (see below), whose sum is σ = 49973110215. Its totient is φ = 13325700968.

The previous prime is 26651863681. The next prime is 26651863691. The reversal of 26651863688 is 88636815662.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 13325931844 + 13325931844 = 115438^2 + 115438^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=115438.

It is a super-2 number, since 2×26651863688² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26651863681) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 432893 + ... + 490611.

Almost surely, 2^26651863688 is an apocalyptic number.

It is an amenable number.

26651863688 is a deficient number, since it is larger than the sum of its proper divisors (23321246527).

26651863688 is an frugal number, since it uses more digits than its factorization.

26651863688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115444 (or 57721 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 59.

The spelling of 26651863688 in words is "twenty-six billion, six hundred fifty-one million, eight hundred sixty-three thousand, six hundred eighty-eight".