26668137644 has 18 divisors (see below), whose sum is σ = 47199562284. Its totient is φ = 13184232160.

The previous prime is 26668137631. The next prime is 26668137673. The reversal of 26668137644 is 44673186662.

It is a super-2 number, since 2×26668137644² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 389162 + ... + 452529.

Almost surely, 2^26668137644 is an apocalyptic number.

It is an amenable number.

26668137644 is a deficient number, since it is larger than the sum of its proper divisors (20531424640).

26668137644 is an equidigital number, since it uses as much as digits as its factorization.

26668137644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841873 (or 841782 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 53.

The spelling of 26668137644 in words is "twenty-six billion, six hundred sixty-eight million, one hundred thirty-seven thousand, six hundred forty-four".