19969246816 has 24 divisors (see below), whose sum is σ = 39490766784. Its totient is φ = 9939845760.

The previous prime is 19969246789. The next prime is 19969246819. The reversal of 19969246816 is 61864296991.

It is a super-2 number, since 2×19969246816² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19969246819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1392055 + ... + 1406326.

It is an arithmetic number, because the mean of its divisors is an integer number (1645448616).

Almost surely, 2^19969246816 is an apocalyptic number.

19969246816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19969246816 is a deficient number, since it is larger than the sum of its proper divisors (19521519968).

19969246816 is a wasteful number, since it uses less digits than its factorization.

19969246816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798614 (or 2798606 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 61.

The spelling of 19969246816 in words is "nineteen billion, nine hundred sixty-nine million, two hundred forty-six thousand, eight hundred sixteen".