6477766687 has 4 divisors (see below), whose sum is σ = 7403161936. Its totient is φ = 5552371440.

The previous prime is 6477766679. The next prime is 6477766693. The reversal of 6477766687 is 7866677746.

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

It is not a de Polignac number, because 6477766687 - 2³ = 6477766679 is a prime.

It is a super-2 number, since 2×6477766687² = 83922922502413911938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6477766637) 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, 462697614 + ... + 462697627.

It is an arithmetic number, because the mean of its divisors is an integer number (1850790484).

Almost surely, 2^6477766687 is an apocalyptic number.

6477766687 is a deficient number, since it is larger than the sum of its proper divisors (925395249).

6477766687 is an equidigital number, since it uses as much as digits as its factorization.

6477766687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925395248.

The product of its digits is 99574272, while the sum is 64.

The square root of 6477766687 is about 80484.5742176723. The cubic root of 6477766687 is about 1864.1252992476.

The spelling of 6477766687 in words is "six billion, four hundred seventy-seven million, seven hundred sixty-six thousand, six hundred eighty-seven".