673770557 has 2 divisors, whose sum is σ = 673770558. Its totient is φ = 673770556.

The previous prime is 673770553. The next prime is 673770563. The reversal of 673770557 is 755077376.

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., 346667161 + 327103396 = 18619^2 + 18086^2 .

It is a cyclic number.

It is not a de Polignac number, because 673770557 - 2² = 673770553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673770553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336885278 + 336885279.

It is an arithmetic number, because the mean of its divisors is an integer number (336885279).

Almost surely, 2^673770557 is an apocalyptic number.

It is an amenable number.

673770557 is a deficient number, since it is larger than the sum of its proper divisors (1).

673770557 is an equidigital number, since it uses as much as digits as its factorization.

673770557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080450, while the sum is 47.

The square root of 673770557 is about 25957.0906882879. The cubic root of 673770557 is about 876.6724180654.

The spelling of 673770557 in words is "six hundred seventy-three million, seven hundred seventy thousand, five hundred fifty-seven".