194780646469 has 4 divisors (see below), whose sum is σ = 194781548844. Its totient is φ = 194779744096.

The previous prime is 194780646443. The next prime is 194780646527. The reversal of 194780646469 is 964646087491.

194780646469 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2794708225 + 191985938244 = 52865^2 + 438162^2 .

It is a cyclic number.

It is not a de Polignac number, because 194780646469 - 2¹³ = 194780638277 is a prime.

It is a super-2 number, since 2×194780646469² (a number of 23 digits) contains 22 as substring.

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 194780646469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194780646439) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 84969 + ... + 629905.

It is an arithmetic number, because the mean of its divisors is an integer number (48695387211).

Almost surely, 2^194780646469 is an apocalyptic number.

It is an amenable number.

194780646469 is a deficient number, since it is larger than the sum of its proper divisors (902375).

194780646469 is an equidigital number, since it uses as much as digits as its factorization.

194780646469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902374.

The product of its (nonzero) digits is 62705664, while the sum is 64.

The spelling of 194780646469 in words is "one hundred ninety-four billion, seven hundred eighty million, six hundred forty-six thousand, four hundred sixty-nine".