19866072512 has 56 divisors (see below), whose sum is σ = 46313671152. Its totient is φ = 8335411200.

The previous prime is 19866072511. The next prime is 19866072529. The reversal of 19866072512 is 21527066891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19866072511) 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, 1076189 + ... + 1094492.

It is an arithmetic number, because the mean of its divisors is an integer number (827029842).

Almost surely, 2^19866072512 is an apocalyptic number.

It is an amenable number.

19866072512 is an abundant number, since it is smaller than the sum of its proper divisors (26447598640).

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

19866072512 is a wasteful number, since it uses less digits than its factorization.

19866072512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170717 (or 2170707 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

It can be divided in two parts, 198660 and 72512, that added together give a palindrome (271172).

The spelling of 19866072512 in words is "nineteen billion, eight hundred sixty-six million, seventy-two thousand, five hundred twelve".