19928497611 has 32 divisors (see below), whose sum is σ = 29125248768. Its totient is φ = 12020365440.

The previous prime is 19928497609. The next prime is 19928497627. The reversal of 19928497611 is 11679482991.

It is not a de Polignac number, because 19928497611 - 2¹ = 19928497609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19928497651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10099621 + ... + 10101593.

It is an arithmetic number, because the mean of its divisors is an integer number (910164024).

Almost surely, 2^19928497611 is an apocalyptic number.

19928497611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19928497611 is a deficient number, since it is larger than the sum of its proper divisors (9196751157).

19928497611 is a wasteful number, since it uses less digits than its factorization.

19928497611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291.

The product of its digits is 1959552, while the sum is 57.

The spelling of 19928497611 in words is "nineteen billion, nine hundred twenty-eight million, four hundred ninety-seven thousand, six hundred eleven".