668008774436 has 24 divisors (see below), whose sum is σ = 1174335771000. Its totient is φ = 332484804864.

The previous prime is 668008774427. The next prime is 668008774439. The reversal of 668008774436 is 634477800866.

668008774436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 626225326336 + 41783448100 = 791344^2 + 204410^2 .

It is not an unprimeable number, because it can be changed into a prime (668008774439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5147030 + ... + 5275218.

It is an arithmetic number, because the mean of its divisors is an integer number (48930657125).

Almost surely, 2^668008774436 is an apocalyptic number.

It is an amenable number.

668008774436 is a deficient number, since it is larger than the sum of its proper divisors (506326996564).

668008774436 is a wasteful number, since it uses less digits than its factorization.

668008774436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134111 (or 134109 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 59.

The spelling of 668008774436 in words is "six hundred sixty-eight billion, eight million, seven hundred seventy-four thousand, four hundred thirty-six".