19603640169 has 45 divisors (see below), whose sum is σ = 30011448621. Its totient is φ = 12752384040.

The previous prime is 19603640141. The next prime is 19603640171. The reversal of 19603640169 is 96104630691.

The square root of 19603640169 is 140013.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-19603640169 is a prime.

It is a super-2 number, since 2×19603640169² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19603640129) 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 44 ways as a sum of consecutive naturals, for example, 59225334 + ... + 59225664.

Almost surely, 2^19603640169 is an apocalyptic number.

19603640169 is the 140013-rd square number.

19603640169 is the 70007-th centered octagonal number.

It is an amenable number.

19603640169 is a deficient number, since it is larger than the sum of its proper divisors (10407808452).

19603640169 is an frugal number, since it uses more digits than its factorization.

19603640169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 19603640169 in words is "nineteen billion, six hundred three million, six hundred forty thousand, one hundred sixty-nine".