668494115 has 4 divisors (see below), whose sum is σ = 802192944. Its totient is φ = 534795288.

The previous prime is 668494097. The next prime is 668494117. The reversal of 668494115 is 511494866.

668494115 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 is a cyclic number.

It is not a de Polignac number, because 668494115 - 2¹² = 668490019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668494117) 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, 66849407 + ... + 66849416.

It is an arithmetic number, because the mean of its divisors is an integer number (200548236).

Almost surely, 2^668494115 is an apocalyptic number.

668494115 is a deficient number, since it is larger than the sum of its proper divisors (133698829).

668494115 is a wasteful number, since it uses less digits than its factorization.

668494115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133698828.

The product of its digits is 207360, while the sum is 44.

The square root of 668494115 is about 25855.2531412864. The cubic root of 668494115 is about 874.3779480819.

The spelling of 668494115 in words is "six hundred sixty-eight million, four hundred ninety-four thousand, one hundred fifteen".