674721738673 has 2 divisors, whose sum is σ = 674721738674. Its totient is φ = 674721738672.

The previous prime is 674721738539. The next prime is 674721738689. The reversal of 674721738673 is 376837127476.

674721738673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560472330609 + 114249408064 = 748647^2 + 338008^2 .

It is a cyclic number.

It is not a de Polignac number, because 674721738673 - 2¹⁷ = 674721607601 is a prime.

It is a super-2 number, since 2×674721738673² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (674721738773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337360869336 + 337360869337.

It is an arithmetic number, because the mean of its divisors is an integer number (337360869337).

Almost surely, 2^674721738673 is an apocalyptic number.

It is an amenable number.

674721738673 is a deficient number, since it is larger than the sum of its proper divisors (1).

674721738673 is an equidigital number, since it uses as much as digits as its factorization.

674721738673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49787136, while the sum is 61.

The spelling of 674721738673 in words is "six hundred seventy-four billion, seven hundred twenty-one million, seven hundred thirty-eight thousand, six hundred seventy-three".