674289661 has 4 divisors (see below), whose sum is σ = 675109792. Its totient is φ = 673469532.

The previous prime is 674289659. The next prime is 674289677. The reversal of 674289661 is 166982476.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 674289661 - 2¹ = 674289659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (674289641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408831 + ... + 410476.

It is an arithmetic number, because the mean of its divisors is an integer number (168777448).

Almost surely, 2^674289661 is an apocalyptic number.

It is an amenable number.

674289661 is a deficient number, since it is larger than the sum of its proper divisors (820131).

674289661 is an equidigital number, since it uses as much as digits as its factorization.

674289661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820130.

The product of its digits is 870912, while the sum is 49.

The square root of 674289661 is about 25967.0880346642. The cubic root of 674289661 is about 876.8975032627.

The spelling of 674289661 in words is "six hundred seventy-four million, two hundred eighty-nine thousand, six hundred sixty-one".