513370660720666 has 16 divisors (see below), whose sum is σ = 896668970747904. Its totient is φ = 215864752216464.

The previous prime is 513370660720597. The next prime is 513370660720667. The reversal of 513370660720666 is 666027066073315.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 513370660720666.

It is not an unprimeable number, because it can be changed into a prime (513370660720667) 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, 345937102170 + ... + 345937103653.

It is an arithmetic number, because the mean of its divisors is an integer number (56041810671744).

Almost surely, 2^{513370660720666} is an apocalyptic number.

513370660720666 is a deficient number, since it is larger than the sum of its proper divisors (383298310027238).

513370660720666 is a wasteful number, since it uses less digits than its factorization.

513370660720666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691874205885.

The product of its (nonzero) digits is 34292160, while the sum is 58.

The spelling of 513370660720666 in words is "five hundred thirteen trillion, three hundred seventy billion, six hundred sixty million, seven hundred twenty thousand, six hundred sixty-six".