674805557 has 2 divisors, whose sum is σ = 674805558. Its totient is φ = 674805556.

The previous prime is 674805499. The next prime is 674805559. The reversal of 674805557 is 755508476.

674805557 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., 633730276 + 41075281 = 25174^2 + 6409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-674805557 is a prime.

Together with 674805559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (674805559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337402778 + 337402779.

It is an arithmetic number, because the mean of its divisors is an integer number (337402779).

Almost surely, 2^674805557 is an apocalyptic number.

It is an amenable number.

674805557 is a deficient number, since it is larger than the sum of its proper divisors (1).

674805557 is an equidigital number, since it uses as much as digits as its factorization.

674805557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176000, while the sum is 47.

The square root of 674805557 is about 25977.0197867269. The cubic root of 674805557 is about 877.1210830367.

It can be divided in two parts, 67480 and 5557, that added together give a palindrome (73037).

The spelling of 674805557 in words is "six hundred seventy-four million, eight hundred five thousand, five hundred fifty-seven".