668411777 has 4 divisors (see below), whose sum is σ = 729176496. Its totient is φ = 607647060.

The previous prime is 668411743. The next prime is 668411791. The reversal of 668411777 is 777114866.

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 668411777 - 2¹² = 668407681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668411077) 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, 30382343 + ... + 30382364.

It is an arithmetic number, because the mean of its divisors is an integer number (182294124).

Almost surely, 2^668411777 is an apocalyptic number.

It is an amenable number.

668411777 is a deficient number, since it is larger than the sum of its proper divisors (60764719).

668411777 is a wasteful number, since it uses less digits than its factorization.

668411777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60764718.

The product of its digits is 395136, while the sum is 47.

The square root of 668411777 is about 25853.6608046133. The cubic root of 668411777 is about 874.3420477472.

The spelling of 668411777 in words is "six hundred sixty-eight million, four hundred eleven thousand, seven hundred seventy-seven".