19913244446 has 8 divisors (see below), whose sum is σ = 29930702904. Its totient is φ = 9936343480.

The previous prime is 19913244433. The next prime is 19913244469. The reversal of 19913244446 is 64444231991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19913244446² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19913244446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10138145 + ... + 10140108.

It is an arithmetic number, because the mean of its divisors is an integer number (3741337863).

Almost surely, 2^19913244446 is an apocalyptic number.

19913244446 is a deficient number, since it is larger than the sum of its proper divisors (10017458458).

19913244446 is a wasteful number, since it uses less digits than its factorization.

19913244446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20278746.

The product of its digits is 746496, while the sum is 47.

The spelling of 19913244446 in words is "nineteen billion, nine hundred thirteen million, two hundred forty-four thousand, four hundred forty-six".