19785465912 has 32 divisors (see below), whose sum is σ = 52373293200. Its totient is φ = 6207204864.

The previous prime is 19785465907. The next prime is 19785465913. The reversal of 19785465912 is 21956458791.

It is a happy number.

It is a super-2 number, since 2×19785465912² (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 (19785465913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24246487 + ... + 24247302.

Almost surely, 2^19785465912 is an apocalyptic number.

19785465912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19785465912 is an abundant number, since it is smaller than the sum of its proper divisors (32587827288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19785465912 is a wasteful number, since it uses less digits than its factorization.

19785465912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48493815 (or 48493811 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 57.

The spelling of 19785465912 in words is "nineteen billion, seven hundred eighty-five million, four hundred sixty-five thousand, nine hundred twelve".