664865725474 has 4 divisors (see below), whose sum is σ = 997298588214. Its totient is φ = 332432862736.

The previous prime is 664865725421. The next prime is 664865725493. The reversal of 664865725474 is 474527568466.

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., 662311130625 + 2554594849 = 813825^2 + 50543^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166216431367 + ... + 166216431370.

Almost surely, 2^664865725474 is an apocalyptic number.

664865725474 is a deficient number, since it is larger than the sum of its proper divisors (332432862740).

664865725474 is a wasteful number, since it uses less digits than its factorization.

664865725474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332432862739.

The product of its digits is 270950400, while the sum is 64.

The spelling of 664865725474 in words is "six hundred sixty-four billion, eight hundred sixty-five million, seven hundred twenty-five thousand, four hundred seventy-four".