664820562386 has 4 divisors (see below), whose sum is σ = 997230843582. Its totient is φ = 332410281192.

The previous prime is 664820562379. The next prime is 664820562397. The reversal of 664820562386 is 683265028466.

664820562386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 656286313225 + 8534249161 = 810115^2 + 92381^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166205140595 + ... + 166205140598.

Almost surely, 2^664820562386 is an apocalyptic number.

664820562386 is a deficient number, since it is larger than the sum of its proper divisors (332410281196).

664820562386 is a wasteful number, since it uses less digits than its factorization.

664820562386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332410281195.

The product of its (nonzero) digits is 19906560, while the sum is 56.

The spelling of 664820562386 in words is "six hundred sixty-four billion, eight hundred twenty million, five hundred sixty-two thousand, three hundred eighty-six".