668783061 has 10 divisors (see below), whose sum is σ = 999046422. Its totient is φ = 445855320.

The previous prime is 668783051. The next prime is 668783083. The reversal of 668783061 is 160387866.

It can be written as a sum of positive squares in only one way, i.e., 524639025 + 144144036 = 22905^2 + 12006^2 .

It is not a de Polignac number, because 668783061 - 2¹⁴ = 668766677 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668782998 and 668783016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668783051) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4128210 + ... + 4128371.

Almost surely, 2^668783061 is an apocalyptic number.

It is an amenable number.

668783061 is a deficient number, since it is larger than the sum of its proper divisors (330263361).

668783061 is an equidigital number, since it uses as much as digits as its factorization.

668783061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256593 (or 8256584 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 668783061 is about 25860.8402995726. The cubic root of 668783061 is about 874.5039086115.

The spelling of 668783061 in words is "six hundred sixty-eight million, seven hundred eighty-three thousand, sixty-one".