26819779966644 has 24 divisors (see below), whose sum is σ = 71519413244608. Its totient is φ = 7662794276160.

The previous prime is 26819779966643. The next prime is 26819779966667. The reversal of 26819779966644 is 44666997791862.

It is a Harshad number since it is a multiple of its sum of digits (84), and also a Moran number because the ratio is a prime number: 319283094841 = 26819779966644 / (2 + 6 + 8 + 1 + 9 + 7 + 7 + 9 + 9 + 6 + 6 + 6 + 4 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26819779966643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159641547337 + ... + 159641547504.

Almost surely, 2^{26819779966644} is an apocalyptic number.

It is an amenable number.

26819779966644 is an abundant number, since it is smaller than the sum of its proper divisors (44699633277964).

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

26819779966644 is a wasteful number, since it uses less digits than its factorization.

26819779966644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319283094855 (or 319283094853 counting only the distinct ones).

The product of its digits is 11851370496, while the sum is 84.

The spelling of 26819779966644 in words is "twenty-six trillion, eight hundred nineteen billion, seven hundred seventy-nine million, nine hundred sixty-six thousand, six hundred forty-four".