674721738649 has 12 divisors (see below), whose sum is σ = 797747285028. Its totient is φ = 568852048800.

The previous prime is 674721738539. The next prime is 674721738673. The reversal of 674721738649 is 946837127476.

674721738649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 183976655625 + 490745083024 = 428925^2 + 700532^2 .

It is not a de Polignac number, because 674721738649 - 2¹⁷ = 674721607577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674721738689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112864482 + ... + 112870459.

It is an arithmetic number, because the mean of its divisors is an integer number (66478940419).

Almost surely, 2^674721738649 is an apocalyptic number.

It is an amenable number.

674721738649 is a deficient number, since it is larger than the sum of its proper divisors (123025546379).

674721738649 is a wasteful number, since it uses less digits than its factorization.

674721738649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225735016 (or 225735009 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 64.

The spelling of 674721738649 in words is "six hundred seventy-four billion, seven hundred twenty-one million, seven hundred thirty-eight thousand, six hundred forty-nine".