12501766784 has 48 divisors (see below), whose sum is σ = 26831488110. Its totient is φ = 5767941120.

The previous prime is 12501766763. The next prime is 12501766789. The reversal of 12501766784 is 48766710521.

It can be written as a sum of positive squares in 3 ways, for example, as 6090241600 + 6411525184 = 78040^2 + 80072^2 .

It is not an unprimeable number, because it can be changed into a prime (12501766789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4559654 + ... + 4562394.

Almost surely, 2^12501766784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12501766784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13415744055).

12501766784 is an abundant number, since it is smaller than the sum of its proper divisors (14329721326).

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

12501766784 is an frugal number, since it uses more digits than its factorization.

12501766784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5509 (or 2756 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 12501766784 in words is "twelve billion, five hundred one million, seven hundred sixty-six thousand, seven hundred eighty-four".