6677681 has 4 divisors (see below), whose sum is σ = 6720372. Its totient is φ = 6634992.

The previous prime is 6677677. The next prime is 6677707. The reversal of 6677681 is 1867766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1867766 = 2 ⋅933883.

It can be written as a sum of positive squares in 2 ways, for example, as 2016400 + 4661281 = 1420^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 6677681 - 2² = 6677677 is a prime.

It is a super-2 number, since 2×6677681² = 89182847075522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6677611) 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, 21110 + ... + 21423.

It is an arithmetic number, because the mean of its divisors is an integer number (1680093).

Almost surely, 2^6677681 is an apocalyptic number.

It is an amenable number.

6677681 is a deficient number, since it is larger than the sum of its proper divisors (42691).

6677681 is a wasteful number, since it uses less digits than its factorization.

6677681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42690.

The product of its digits is 84672, while the sum is 41.

The square root of 6677681 is about 2584.1209337026. The cubic root of 6677681 is about 188.3107975924.

The spelling of 6677681 in words is "six million, six hundred seventy-seven thousand, six hundred eighty-one".