19987311164 has 6 divisors (see below), whose sum is σ = 34977794544. Its totient is φ = 9993655580.

The previous prime is 19987311161. The next prime is 19987311173. The reversal of 19987311164 is 46111378991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19987311161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2498413892 + ... + 2498413899.

It is an arithmetic number, because the mean of its divisors is an integer number (5829632424).

Almost surely, 2^19987311164 is an apocalyptic number.

It is an amenable number.

19987311164 is a deficient number, since it is larger than the sum of its proper divisors (14990483380).

19987311164 is a wasteful number, since it uses less digits than its factorization.

19987311164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4996827795 (or 4996827793 counting only the distinct ones).

The product of its digits is 326592, while the sum is 50.

The spelling of 19987311164 in words is "nineteen billion, nine hundred eighty-seven million, three hundred eleven thousand, one hundred sixty-four".