19957534612 has 12 divisors (see below), whose sum is σ = 35668785600. Its totient is φ = 9766453016.

The previous prime is 19957534577. The next prime is 19957534651. The reversal of 19957534612 is 21643575991.

It is a self number, because there is not a number n which added to its sum of digits gives 19957534612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53078362 + ... + 53078737.

It is an arithmetic number, because the mean of its divisors is an integer number (2972398800).

Almost surely, 2^19957534612 is an apocalyptic number.

It is an amenable number.

19957534612 is a deficient number, since it is larger than the sum of its proper divisors (15711250988).

19957534612 is a wasteful number, since it uses less digits than its factorization.

19957534612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106157150 (or 106157148 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 52.

The spelling of 19957534612 in words is "nineteen billion, nine hundred fifty-seven million, five hundred thirty-four thousand, six hundred twelve".