6491877842 has 8 divisors (see below), whose sum is σ = 9738353100. Its totient is φ = 3245760144.

The previous prime is 6491877827. The next prime is 6491877863. The reversal of 6491877842 is 2487781946.

6491877842 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6251906761 + 239971081 = 79069^2 + 15491^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38117 + ... + 120152.

Almost surely, 2^6491877842 is an apocalyptic number.

6491877842 is a deficient number, since it is larger than the sum of its proper divisors (3246475258).

6491877842 is a wasteful number, since it uses less digits than its factorization.

6491877842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178780.

The product of its digits is 5419008, while the sum is 56.

The square root of 6491877842 is about 80572.1902519722. The cubic root of 6491877842 is about 1865.4779199114.

The spelling of 6491877842 in words is "six billion, four hundred ninety-one million, eight hundred seventy-seven thousand, eight hundred forty-two".