26681979745 has 8 divisors (see below), whose sum is σ = 32312122920. Its totient is φ = 21149752320.

The previous prime is 26681979721. The next prime is 26681979767. The reversal of 26681979745 is 54797918662.

It can be written as a sum of positive squares in 4 ways, for example, as 115261696 + 26566718049 = 10736^2 + 162993^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26681979745 - 2¹³ = 26681971553 is a prime.

It is a super-2 number, since 2×26681979745² (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 7 ways as a sum of consecutive naturals, for example, 24478336 + ... + 24479425.

It is an arithmetic number, because the mean of its divisors is an integer number (4039015365).

Almost surely, 2^26681979745 is an apocalyptic number.

It is an amenable number.

26681979745 is a deficient number, since it is larger than the sum of its proper divisors (5630143175).

26681979745 is a wasteful number, since it uses less digits than its factorization.

26681979745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48957875.

The product of its digits is 45722880, while the sum is 64.

The spelling of 26681979745 in words is "twenty-six billion, six hundred eighty-one million, nine hundred seventy-nine thousand, seven hundred forty-five".