6721277385 has 16 divisors (see below), whose sum is σ = 10757324160. Its totient is φ = 3583587840.

The previous prime is 6721277377. The next prime is 6721277399. The reversal of 6721277385 is 5837721276.

It is not a de Polignac number, because 6721277385 - 2³ = 6721277377 is a prime.

It is a super-2 number, since 2×6721277385² = 90351139372224876450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16245 + ... + 117074.

It is an arithmetic number, because the mean of its divisors is an integer number (672332760).

Almost surely, 2^6721277385 is an apocalyptic number.

It is an amenable number.

6721277385 is a deficient number, since it is larger than the sum of its proper divisors (4036046775).

6721277385 is a wasteful number, since it uses less digits than its factorization.

6721277385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136688.

The product of its digits is 987840, while the sum is 48.

The square root of 6721277385 is about 81983.3970081748. The cubic root of 6721277385 is about 1887.1971542243.

The spelling of 6721277385 in words is "six billion, seven hundred twenty-one million, two hundred seventy-seven thousand, three hundred eighty-five".