6739666578 has 12 divisors (see below), whose sum is σ = 14602610958. Its totient is φ = 2246555520.

The previous prime is 6739666561. The next prime is 6739666579. The reversal of 6739666578 is 8756669376.

It can be written as a sum of positive squares in only one way, i.e., 3635728209 + 3103938369 = 60297^2 + 55713^2 .

It is a super-2 number, since 2×6739666578² = 90846211165220460168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6739666579) 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, 187212943 + ... + 187212978.

Almost surely, 2^6739666578 is an apocalyptic number.

6739666578 is an abundant number, since it is smaller than the sum of its proper divisors (7862944380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6739666578 is a wasteful number, since it uses less digits than its factorization.

6739666578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374425929 (or 374425926 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 63.

The square root of 6739666578 is about 82095.4723355679. The cubic root of 6739666578 is about 1888.9166900127.

The spelling of 6739666578 in words is "six billion, seven hundred thirty-nine million, six hundred sixty-six thousand, five hundred seventy-eight".