668044415 has 4 divisors (see below), whose sum is σ = 801653304. Its totient is φ = 534435528.

The previous prime is 668044411. The next prime is 668044439. The reversal of 668044415 is 514440866.

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 668044415 - 2² = 668044411 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 (668044411) 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, 66804437 + ... + 66804446.

It is an arithmetic number, because the mean of its divisors is an integer number (200413326).

Almost surely, 2^668044415 is an apocalyptic number.

668044415 is a deficient number, since it is larger than the sum of its proper divisors (133608889).

668044415 is a wasteful number, since it uses less digits than its factorization.

668044415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133608888.

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 668044415 is about 25846.5551863300. Note that the first 3 decimals coincide. The cubic root of 668044415 is about 874.1818376707.

The spelling of 668044415 in words is "six hundred sixty-eight million, forty-four thousand, four hundred fifteen".