668778337 has 4 divisors (see below), whose sum is σ = 697855680. Its totient is φ = 639700996.

The previous prime is 668778311. The next prime is 668778349. The reversal of 668778337 is 733877866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668778337 - 2¹¹ = 668776289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668778377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14538637 + ... + 14538682.

It is an arithmetic number, because the mean of its divisors is an integer number (174463920).

Almost surely, 2^668778337 is an apocalyptic number.

It is an amenable number.

668778337 is a deficient number, since it is larger than the sum of its proper divisors (29077343).

668778337 is a wasteful number, since it uses less digits than its factorization.

668778337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29077342.

The product of its digits is 7112448, while the sum is 55.

The square root of 668778337 is about 25860.7489644055. The cubic root of 668778337 is about 874.5018495651.

The spelling of 668778337 in words is "six hundred sixty-eight million, seven hundred seventy-eight thousand, three hundred thirty-seven".