194923986645 has 16 divisors (see below), whose sum is σ = 312387167232. Its totient is φ = 103789863360.

The previous prime is 194923986641. The next prime is 194923986701. The reversal of 194923986645 is 546689329491.

It is not a de Polignac number, because 194923986645 - 2² = 194923986641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194923986641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10590261 + ... + 10608650.

It is an arithmetic number, because the mean of its divisors is an integer number (19524197952).

Almost surely, 2^194923986645 is an apocalyptic number.

194923986645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

194923986645 is a deficient number, since it is larger than the sum of its proper divisors (117463180587).

194923986645 is a wasteful number, since it uses less digits than its factorization.

194923986645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21199532.

The product of its digits is 100776960, while the sum is 66.

The spelling of 194923986645 in words is "one hundred ninety-four billion, nine hundred twenty-three million, nine hundred eighty-six thousand, six hundred forty-five".