6766478913779 has 4 divisors (see below), whose sum is σ = 7286977291776. Its totient is φ = 6245980535784.

The previous prime is 6766478913773. The next prime is 6766478913791. The reversal of 6766478913779 is 9773198746676.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6766478913779 - 2²⁴ = 6766462136563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6766478913773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260249188979 + ... + 260249189004.

It is an arithmetic number, because the mean of its divisors is an integer number (1821744322944).

Almost surely, 2^{6766478913779} is an apocalyptic number.

6766478913779 is a deficient number, since it is larger than the sum of its proper divisors (520498377997).

6766478913779 is a wasteful number, since it uses less digits than its factorization.

6766478913779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520498377996.

The product of its digits is 4032758016, while the sum is 80.

The spelling of 6766478913779 in words is "six trillion, seven hundred sixty-six billion, four hundred seventy-eight million, nine hundred thirteen thousand, seven hundred seventy-nine".