12129763840 has 80 divisors (see below), whose sum is σ = 30793879512. Its totient is φ = 4566482944.

The previous prime is 12129763819. The next prime is 12129763879. The reversal of 12129763840 is 4836792121.

It can be written as a sum of positive squares in 4 ways, for example, as 11073773824 + 1055990016 = 105232^2 + 32496^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95839 + ... + 182878.

Almost surely, 2^12129763840 is an apocalyptic number.

12129763840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12129763840 is an abundant number, since it is smaller than the sum of its proper divisors (18664115672).

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

12129763840 is an equidigital number, since it uses as much as digits as its factorization.

12129763840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278757 (or 278741 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 12129763840 in words is "twelve billion, one hundred twenty-nine million, seven hundred sixty-three thousand, eight hundred forty".