19909774405 has 8 divisors (see below), whose sum is σ = 24715582200. Its totient is φ = 15378584256.

The previous prime is 19909774399. The next prime is 19909774411. The reversal of 19909774405 is 50447790991.

It is a Cunningham number, because it is equal to 141102²+1.

It is an interprime number because it is at equal distance from previous prime (19909774399) and next prime (19909774411).

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 19909774404 = 1^2 + 141102^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19909774405 - 2¹¹ = 19909772357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68654250 + ... + 68654539.

It is an arithmetic number, because the mean of its divisors is an integer number (3089447775).

Almost surely, 2^19909774405 is an apocalyptic number.

It is an amenable number.

19909774405 is a deficient number, since it is larger than the sum of its proper divisors (4805807795).

19909774405 is a wasteful number, since it uses less digits than its factorization.

19909774405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137308823.

The product of its (nonzero) digits is 2857680, while the sum is 55.

The spelling of 19909774405 in words is "nineteen billion, nine hundred nine million, seven hundred seventy-four thousand, four hundred five".