26668979381 has 16 divisors (see below), whose sum is σ = 30847340160. Its totient is φ = 22786874880.

The previous prime is 26668979377. The next prime is 26668979417. The reversal of 26668979381 is 18397986662.

It is not a de Polignac number, because 26668979381 - 2² = 26668979377 is a prime.

It is a super-2 number, since 2×26668979381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26668979881) 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 in 15 ways as a sum of consecutive naturals, for example, 37865 + ... + 234033.

It is an arithmetic number, because the mean of its divisors is an integer number (1927958760).

Almost surely, 2^26668979381 is an apocalyptic number.

It is an amenable number.

26668979381 is a deficient number, since it is larger than the sum of its proper divisors (4178360779).

26668979381 is a wasteful number, since it uses less digits than its factorization.

26668979381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196924.

The product of its digits is 47029248, while the sum is 65.

The spelling of 26668979381 in words is "twenty-six billion, six hundred sixty-eight million, nine hundred seventy-nine thousand, three hundred eighty-one".