673725721373 has 2 divisors, whose sum is σ = 673725721374. Its totient is φ = 673725721372.

The previous prime is 673725721351. The next prime is 673725721439. The reversal of 673725721373 is 373127527376.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509884539844 + 163841181529 = 714062^2 + 404773^2 .

It is a cyclic number.

It is not a de Polignac number, because 673725721373 - 2⁶ = 673725721309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673725721573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336862860686 + 336862860687.

It is an arithmetic number, because the mean of its divisors is an integer number (336862860687).

Almost surely, 2^673725721373 is an apocalyptic number.

It is an amenable number.

673725721373 is a deficient number, since it is larger than the sum of its proper divisors (1).

673725721373 is an equidigital number, since it uses as much as digits as its factorization.

673725721373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7779240, while the sum is 53.

The spelling of 673725721373 in words is "six hundred seventy-three billion, seven hundred twenty-five million, seven hundred twenty-one thousand, three hundred seventy-three".