19528069891 has 16 divisors (see below), whose sum is σ = 22241288448. Its totient is φ = 16971988000.

The previous prime is 19528069889. The next prime is 19528069963. The reversal of 19528069891 is 19896082591.

It is not a de Polignac number, because 19528069891 - 2¹ = 19528069889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19528069861) 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, 485916 + ... + 524566.

It is an arithmetic number, because the mean of its divisors is an integer number (1390080528).

Almost surely, 2^19528069891 is an apocalyptic number.

19528069891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19528069891 is a deficient number, since it is larger than the sum of its proper divisors (2713218557).

19528069891 is a wasteful number, since it uses less digits than its factorization.

19528069891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40682.

The product of its (nonzero) digits is 2799360, while the sum is 58.

The spelling of 19528069891 in words is "nineteen billion, five hundred twenty-eight million, sixty-nine thousand, eight hundred ninety-one".