668670055 has 4 divisors (see below), whose sum is σ = 802404072. Its totient is φ = 534936040.

The previous prime is 668670043. The next prime is 668670077. The reversal of 668670055 is 550076866.

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

It is not a de Polignac number, because 668670055 - 2⁷ = 668669927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668669993 and 668670020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66867001 + ... + 66867010.

It is an arithmetic number, because the mean of its divisors is an integer number (200601018).

Almost surely, 2^668670055 is an apocalyptic number.

668670055 is a deficient number, since it is larger than the sum of its proper divisors (133734017).

668670055 is a wasteful number, since it uses less digits than its factorization.

668670055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133734016.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 668670055 is about 25858.6553208012. The cubic root of 668670055 is about 874.4546501094.

The spelling of 668670055 in words is "six hundred sixty-eight million, six hundred seventy thousand, fifty-five".