19945988458 has 16 divisors (see below), whose sum is σ = 32663909664. Its totient is φ = 9059408560.

The previous prime is 19945988441. The next prime is 19945988467. The reversal of 19945988458 is 85488954991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318085 + ... + 375592.

It is an arithmetic number, because the mean of its divisors is an integer number (2041494354).

Almost surely, 2^19945988458 is an apocalyptic number.

19945988458 is a deficient number, since it is larger than the sum of its proper divisors (12717921206).

19945988458 is a wasteful number, since it uses less digits than its factorization.

19945988458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694997.

The product of its digits is 149299200, while the sum is 70.

The spelling of 19945988458 in words is "nineteen billion, nine hundred forty-five million, nine hundred eighty-eight thousand, four hundred fifty-eight".