674666681 has 4 divisors (see below), whose sum is σ = 726564132. Its totient is φ = 622769232.

The previous prime is 674666651. The next prime is 674666693. The reversal of 674666681 is 186666476.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 360810025 + 313856656 = 18995^2 + 17716^2 .

It is a cyclic number.

It is not a de Polignac number, because 674666681 - 2²² = 670472377 is a prime.

It is a super-2 number, since 2×674666681² = 910350260903111522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674666651) 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, 25948706 + ... + 25948731.

It is an arithmetic number, because the mean of its divisors is an integer number (181641033).

Almost surely, 2^674666681 is an apocalyptic number.

It is an amenable number.

674666681 is a deficient number, since it is larger than the sum of its proper divisors (51897451).

674666681 is a wasteful number, since it uses less digits than its factorization.

674666681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51897450.

The product of its digits is 1741824, while the sum is 50.

The square root of 674666681 is about 25974.3465942841. The cubic root of 674666681 is about 877.0609079618.

It can be divided in two parts, 67466 and 6681, that added together give a palindrome (74147).

The spelling of 674666681 in words is "six hundred seventy-four million, six hundred sixty-six thousand, six hundred eighty-one".