26668980684 has 18 divisors (see below), whose sum is σ = 67413256820. Its totient is φ = 8889660216.

The previous prime is 26668980619. The next prime is 26668980691. The reversal of 26668980684 is 48608986662.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×26668980684² (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 (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 370402474 + ... + 370402545.

Almost surely, 2^26668980684 is an apocalyptic number.

It is an amenable number.

26668980684 is an abundant number, since it is smaller than the sum of its proper divisors (40744276136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26668980684 is a wasteful number, since it uses less digits than its factorization.

26668980684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740805029 (or 740805024 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 63.

The spelling of 26668980684 in words is "twenty-six billion, six hundred sixty-eight million, nine hundred eighty thousand, six hundred eighty-four".