19540983969 has 16 divisors (see below), whose sum is σ = 31176499200. Its totient is φ = 12025220688.

The previous prime is 19540983953. The next prime is 19540984009. The reversal of 19540983969 is 96938904591.

19540983969 is a `hidden beast` number, since 1 + 9 + 540 + 9 + 83 + 9 + 6 + 9 = 666.

It is not a de Polignac number, because 19540983969 - 2⁴ = 19540983953 is a prime.

It is a super-2 number, since 2×19540983969² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19540983919) 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, 27835809 + ... + 27836510.

It is an arithmetic number, because the mean of its divisors is an integer number (1948531200).

Almost surely, 2^19540983969 is an apocalyptic number.

It is an amenable number.

19540983969 is a deficient number, since it is larger than the sum of its proper divisors (11635515231).

19540983969 is a wasteful number, since it uses less digits than its factorization.

19540983969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55672341 (or 55672335 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 63.

It can be divided in two parts, 195409 and 83969, that added together give a triangular number (279378 = T₇₄₇).

The spelling of 19540983969 in words is "nineteen billion, five hundred forty million, nine hundred eighty-three thousand, nine hundred sixty-nine".