6486771557 has 6 divisors (see below), whose sum is σ = 7545836358. Its totient is φ = 5560089864.

The previous prime is 6486771553. The next prime is 6486771569. The reversal of 6486771557 is 7551776846.

It can be written as a sum of positive squares in only one way, i.e., 5802478276 + 684293281 = 76174^2 + 26159^2 .

It is not a de Polignac number, because 6486771557 - 2² = 6486771553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6486771553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66191498 + ... + 66191595.

It is an arithmetic number, because the mean of its divisors is an integer number (1257639393).

Almost surely, 2^6486771557 is an apocalyptic number.

It is an amenable number.

6486771557 is a deficient number, since it is larger than the sum of its proper divisors (1059064801).

6486771557 is a wasteful number, since it uses less digits than its factorization.

6486771557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132383107 (or 132383100 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 56.

The square root of 6486771557 is about 80540.4963791508. The cubic root of 6486771557 is about 1864.9886849647.

The spelling of 6486771557 in words is "six billion, four hundred eighty-six million, seven hundred seventy-one thousand, five hundred fifty-seven".