320206187221636 has 9 divisors (see below), whose sum is σ = 560360890267941. Its totient is φ = 160103075716512.

The previous prime is 320206187221621. The next prime is 320206187221649. The reversal of 320206187221636 is 636122781602023.

The square root of 320206187221636 is 17894306.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3118932602500 + 317087254619136 = 1766050^2 + 17806944^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320206187221636.

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 in 2 ways as a sum of consecutive naturals, for example, 31315036 + ... + 40262188.

Almost surely, 2^{320206187221636} is an apocalyptic number.

320206187221636 is the 17894306-th square number.

It is an amenable number.

320206187221636 is a deficient number, since it is larger than the sum of its proper divisors (240154703046305).

320206187221636 is an frugal number, since it uses more digits than its factorization.

320206187221636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17894310 (or 8947155 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 320206187221636 in words is "three hundred twenty trillion, two hundred six billion, one hundred eighty-seven million, two hundred twenty-one thousand, six hundred thirty-six".