19987291045 has 16 divisors (see below), whose sum is σ = 24121843200. Its totient is φ = 15898633344.

The previous prime is 19987291043. The next prime is 19987291061. The reversal of 19987291045 is 54019278991.

It is a cyclic number.

It is not a de Polignac number, because 19987291045 - 2¹ = 19987291043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19987291043) 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, 835156 + ... + 858754.

It is an arithmetic number, because the mean of its divisors is an integer number (1507615200).

Almost surely, 2^19987291045 is an apocalyptic number.

It is an amenable number.

19987291045 is a deficient number, since it is larger than the sum of its proper divisors (4134552155).

19987291045 is a wasteful number, since it uses less digits than its factorization.

19987291045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24564.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 19987291045 in words is "nineteen billion, nine hundred eighty-seven million, two hundred ninety-one thousand, forty-five".