673157557 has 4 divisors (see below), whose sum is σ = 689576076. Its totient is φ = 656739040.

The previous prime is 673157521. The next prime is 673157579. The reversal of 673157557 is 755751376.

673157557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 276590161 + 396567396 = 16631^2 + 19914^2 .

It is a cyclic number.

It is not a de Polignac number, because 673157557 - 2¹⁵ = 673124789 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 (673157057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8209198 + ... + 8209279.

It is an arithmetic number, because the mean of its divisors is an integer number (172394019).

Almost surely, 2^673157557 is an apocalyptic number.

It is an amenable number.

673157557 is a deficient number, since it is larger than the sum of its proper divisors (16418519).

673157557 is a wasteful number, since it uses less digits than its factorization.

673157557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16418518.

The product of its digits is 771750, while the sum is 46.

The square root of 673157557 is about 25945.2800524488. The cubic root of 673157557 is about 876.4064703351.

The spelling of 673157557 in words is "six hundred seventy-three million, one hundred fifty-seven thousand, five hundred fifty-seven".