6777491006491 has 4 divisors (see below), whose sum is σ = 6779369992912. Its totient is φ = 6775612020072.

The previous prime is 6777491006477. The next prime is 6777491006497. The reversal of 6777491006491 is 1946001947776.

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 6777491006491 - 2⁹ = 6777491005979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6777491006497) 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, 939487800 + ... + 939495013.

It is an arithmetic number, because the mean of its divisors is an integer number (1694842498228).

Almost surely, 2^{6777491006491} is an apocalyptic number.

6777491006491 is a deficient number, since it is larger than the sum of its proper divisors (1878986421).

6777491006491 is a wasteful number, since it uses less digits than its factorization.

6777491006491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878986420.

The product of its (nonzero) digits is 16003008, while the sum is 61.

The spelling of 6777491006491 in words is "six trillion, seven hundred seventy-seven billion, four hundred ninety-one million, six thousand, four hundred ninety-one".