26640464143779 has 20 divisors (see below), whose sum is σ = 39796696383136. Its totient is φ = 17760109728816.

The previous prime is 26640464143669. The next prime is 26640464143817. The reversal of 26640464143779 is 97734146404662.

It is a happy number.

26640464143779 is a `hidden beast` number, since 2 + 6 + 64 + 0 + 464 + 1 + 43 + 7 + 79 = 666.

It is not a de Polignac number, because 26640464143779 - 2¹⁷ = 26640464012707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26640464943779) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5582337 + ... + 9189309.

Almost surely, 2^{26640464143779} is an apocalyptic number.

26640464143779 is a deficient number, since it is larger than the sum of its proper divisors (13156232239357).

26640464143779 is an equidigital number, since it uses as much as digits as its factorization.

26640464143779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698168 (or 3698159 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 63.

The spelling of 26640464143779 in words is "twenty-six trillion, six hundred forty billion, four hundred sixty-four million, one hundred forty-three thousand, seven hundred seventy-nine".