19956105669 has 8 divisors (see below), whose sum is σ = 28008569440. Its totient is φ = 12603856176.

The previous prime is 19956105667. The next prime is 19956105679. The reversal of 19956105669 is 96650165991.

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

It is not a de Polignac number, because 19956105669 - 2¹ = 19956105667 is a prime.

It is a super-2 number, since 2×19956105669² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 350107117 = 19956105669 / (1 + 9 + 9 + 5 + 6 + 1 + 0 + 5 + 6 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19956105667) 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, 175053502 + ... + 175053615.

It is an arithmetic number, because the mean of its divisors is an integer number (3501071180).

Almost surely, 2^19956105669 is an apocalyptic number.

19956105669 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19956105669 is a deficient number, since it is larger than the sum of its proper divisors (8052463771).

19956105669 is a wasteful number, since it uses less digits than its factorization.

19956105669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350107139.

The product of its (nonzero) digits is 3936600, while the sum is 57.

The spelling of 19956105669 in words is "nineteen billion, nine hundred fifty-six million, one hundred five thousand, six hundred sixty-nine".