196746360721 has 3 divisors (see below), whose sum is σ = 196746804283. Its totient is φ = 196745917160.

The previous prime is 196746360703. The next prime is 196746360757. The reversal of 196746360721 is 127063647691.

The square root of 196746360721 is 443561.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127063647691 = 149 ⋅852776159.

It can be written as a sum of positive squares in only one way, i.e., 173981586321 + 22764774400 = 417111^2 + 150880^2 .

It is not a de Polignac number, because 196746360721 - 2⁵ = 196746360689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196746360791) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 221781 + ... + 665341.

Almost surely, 2^196746360721 is an apocalyptic number.

196746360721 is the 443561-st square number.

196746360721 is the 221781-st centered octagonal number.

It is an amenable number.

196746360721 is a deficient number, since it is larger than the sum of its proper divisors (443562).

196746360721 is an frugal number, since it uses more digits than its factorization.

196746360721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887122 (or 443561 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 196746360721 in words is "one hundred ninety-six billion, seven hundred forty-six million, three hundred sixty thousand, seven hundred twenty-one".