19527378511 has 18 divisors (see below), whose sum is σ = 20540331168. Its totient is φ = 18562832640.

The previous prime is 19527378509. The next prime is 19527378517. The reversal of 19527378511 is 11587372591.

It is not a de Polignac number, because 19527378511 - 2¹ = 19527378509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19527378517) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19704226 + ... + 19705216.

Almost surely, 2^19527378511 is an apocalyptic number.

19527378511 is a deficient number, since it is larger than the sum of its proper divisors (1012952657).

19527378511 is an frugal number, since it uses more digits than its factorization.

19527378511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1207 counting only the distinct ones).

The product of its digits is 529200, while the sum is 49.

The spelling of 19527378511 in words is "nineteen billion, five hundred twenty-seven million, three hundred seventy-eight thousand, five hundred eleven".