194965249664 has 64 divisors (see below), whose sum is σ = 399229589160. Its totient is φ = 94770745344.

The previous prime is 194965249657. The next prime is 194965249667. The reversal of 194965249664 is 466942569491.

It can be written as a sum of positive squares in 4 ways, for example, as 184893120064 + 10072129600 = 429992^2 + 100360^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×194965249664² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 194965249664.

It is not an unprimeable number, because it can be changed into a prime (194965249667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6031754 + ... + 6063990.

Almost surely, 2^194965249664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 194965249664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199614794580).

194965249664 is an abundant number, since it is smaller than the sum of its proper divisors (204264339496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

194965249664 is a wasteful number, since it uses less digits than its factorization.

194965249664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33565 (or 33553 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 65.

The spelling of 194965249664 in words is "one hundred ninety-four billion, nine hundred sixty-five million, two hundred forty-nine thousand, six hundred sixty-four".