668833777 has 4 divisors (see below), whose sum is σ = 668897856. Its totient is φ = 668769700.

The previous prime is 668833741. The next prime is 668833783. The reversal of 668833777 is 777338866.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668833777 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (668833717) 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, 12349 + ... + 38602.

It is an arithmetic number, because the mean of its divisors is an integer number (167224464).

Almost surely, 2^668833777 is an apocalyptic number.

It is an amenable number.

668833777 is a deficient number, since it is larger than the sum of its proper divisors (64079).

668833777 is a wasteful number, since it uses less digits than its factorization.

668833777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64078.

The product of its digits is 7112448, while the sum is 55.

The square root of 668833777 is about 25861.8208369016. The cubic root of 668833777 is about 874.5260135470.

The spelling of 668833777 in words is "six hundred sixty-eight million, eight hundred thirty-three thousand, seven hundred seventy-seven".