6491405044 has 12 divisors (see below), whose sum is σ = 11624144224. Its totient is φ = 3170220984.

The previous prime is 6491405027. The next prime is 6491405051. The reversal of 6491405044 is 4405041946.

It is a junction number, because it is equal to n+sod(n) for n = 6491404994 and 6491405012.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 18870192 + ... + 18870535.

Almost surely, 2^6491405044 is an apocalyptic number.

It is an amenable number.

6491405044 is a deficient number, since it is larger than the sum of its proper divisors (5132739180).

6491405044 is a wasteful number, since it uses less digits than its factorization.

6491405044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37740774 (or 37740772 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 6491405044 is about 80569.2561961447. The cubic root of 6491405044 is about 1865.4326317496.

The spelling of 6491405044 in words is "six billion, four hundred ninety-one million, four hundred five thousand, forty-four".