668766777 has 16 divisors (see below), whose sum is σ = 1025569152. Its totient is φ = 379716480.

The previous prime is 668766739. The next prime is 668766779. The reversal of 668766777 is 777667866.

It is a happy number.

It is not a de Polignac number, because 668766777 - 2⁷ = 668766649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668766777.

It is not an unprimeable number, because it can be changed into a prime (668766779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98124 + ... + 104717.

It is an arithmetic number, because the mean of its divisors is an integer number (64098072).

Almost surely, 2^668766777 is an apocalyptic number.

It is an amenable number.

668766777 is a deficient number, since it is larger than the sum of its proper divisors (356802375).

668766777 is a wasteful number, since it uses less digits than its factorization.

668766777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203008.

The product of its digits is 24893568, while the sum is 60.

The square root of 668766777 is about 25860.5254586986. The cubic root of 668766777 is about 874.4968108753.

The spelling of 668766777 in words is "six hundred sixty-eight million, seven hundred sixty-six thousand, seven hundred seventy-seven".