194247968920369 has 81 divisors (see below), whose sum is σ = 255819903374763. Its totient is φ = 146986419644064.

The previous prime is 194247968920363. The next prime is 194247968920393. The reversal of 194247968920369 is 963029869742491.

The square root of 194247968920369 is 13937287.

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., 28734906645025 + 165513062275344 = 5360495^2 + 12865188^2 .

It is not a de Polignac number, because 194247968920369 - 2⁹ = 194247968919857 is a prime.

It is a super-2 number, since 2×194247968920369² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (194247968920363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 29170738362 + ... + 29170745020.

Almost surely, 2^{194247968920369} is an apocalyptic number.

194247968920369 is the 13937287-th square number.

194247968920369 is the 6968644-th centered octagonal number.

It is an amenable number.

194247968920369 is a deficient number, since it is larger than the sum of its proper divisors (61571934454394).

194247968920369 is an frugal number, since it uses more digits than its factorization.

194247968920369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13404 (or 6702 counting only the distinct ones).

The product of its (nonzero) digits is 2539579392, while the sum is 79.

The spelling of 194247968920369 in words is "one hundred ninety-four trillion, two hundred forty-seven billion, nine hundred sixty-eight million, nine hundred twenty thousand, three hundred sixty-nine".