668055569 has 4 divisors (see below), whose sum is σ = 668179440. Its totient is φ = 667931700.

The previous prime is 668055547. The next prime is 668055601. The reversal of 668055569 is 965550866.

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 668055569 - 2¹² = 668051473 is a prime.

It is a super-2 number, since 2×668055569² = 892596486543827522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668055169) 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, 53459 + ... + 64760.

It is an arithmetic number, because the mean of its divisors is an integer number (167044860).

Almost surely, 2^668055569 is an apocalyptic number.

It is an amenable number.

668055569 is a deficient number, since it is larger than the sum of its proper divisors (123871).

668055569 is a wasteful number, since it uses less digits than its factorization.

668055569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123870.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The square root of 668055569 is about 25846.7709588645. The cubic root of 668055569 is about 874.1867029011.

The spelling of 668055569 in words is "six hundred sixty-eight million, fifty-five thousand, five hundred sixty-nine".