19986479764 has 18 divisors (see below), whose sum is σ = 35155058750. Its totient is φ = 9942435552.

The previous prime is 19986479759. The next prime is 19986479767. The reversal of 19986479764 is 46797468991.

It can be written as a sum of positive squares in 3 ways, for example, as 9789519364 + 10196960400 = 98942^2 + 100980^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19986479693 and 19986479702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19986479767) 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 in 5 ways as a sum of consecutive naturals, for example, 90862 + ... + 219610.

Almost surely, 2^19986479764 is an apocalyptic number.

It is an amenable number.

19986479764 is a deficient number, since it is larger than the sum of its proper divisors (15168578986).

19986479764 is a wasteful number, since it uses less digits than its factorization.

19986479764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129147 (or 128948 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 70.

The spelling of 19986479764 in words is "nineteen billion, nine hundred eighty-six million, four hundred seventy-nine thousand, seven hundred sixty-four".