19527994109 has 24 divisors (see below), whose sum is σ = 21534854400. Its totient is φ = 17694992640.

The previous prime is 19527994069. The next prime is 19527994127. The reversal of 19527994109 is 90149972591.

It is not a de Polignac number, because 19527994109 - 2¹⁶ = 19527928573 is a prime.

It is a super-2 number, since 2×19527994109² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19527994159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13569812 + ... + 13571250.

It is an arithmetic number, because the mean of its divisors is an integer number (897285600).

Almost surely, 2^19527994109 is an apocalyptic number.

It is an amenable number.

19527994109 is a deficient number, since it is larger than the sum of its proper divisors (2006860291).

19527994109 is a wasteful number, since it uses less digits than its factorization.

19527994109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885 (or 2872 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 56.

The spelling of 19527994109 in words is "nineteen billion, five hundred twenty-seven million, nine hundred ninety-four thousand, one hundred nine".