668773445 has 4 divisors (see below), whose sum is σ = 802528140. Its totient is φ = 535018752.

The previous prime is 668773403. The next prime is 668773477. The reversal of 668773445 is 544377866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165533956 + 503239489 = 12866^2 + 22433^2 .

It is a cyclic number.

It is not a de Polignac number, because 668773445 - 2¹² = 668769349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668773393 and 668773402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66877340 + ... + 66877349.

It is an arithmetic number, because the mean of its divisors is an integer number (200632035).

Almost surely, 2^668773445 is an apocalyptic number.

It is an amenable number.

668773445 is a deficient number, since it is larger than the sum of its proper divisors (133754695).

668773445 is a wasteful number, since it uses less digits than its factorization.

668773445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133754694.

The product of its digits is 3386880, while the sum is 50.

The square root of 668773445 is about 25860.6543807383. The cubic root of 668773445 is about 874.4997172823.

The spelling of 668773445 in words is "six hundred sixty-eight million, seven hundred seventy-three thousand, four hundred forty-five".