12128761652 has 18 divisors (see below), whose sum is σ = 24690693762. Its totient is φ = 5198040624.

The previous prime is 12128761637. The next prime is 12128761657. The reversal of 12128761652 is 25616782121.

It can be written as a sum of positive squares in only one way, i.e., 10585528996 + 1543232656 = 102886^2 + 39284^2 .

It is a super-2 number, since 2×12128761652² (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 (12128761657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30940523 + ... + 30940914.

It is an arithmetic number, because the mean of its divisors is an integer number (1371705209).

Almost surely, 2^12128761652 is an apocalyptic number.

It is an amenable number.

12128761652 is an abundant number, since it is smaller than the sum of its proper divisors (12561932110).

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

12128761652 is a wasteful number, since it uses less digits than its factorization.

12128761652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61881455 (or 61881446 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The spelling of 12128761652 in words is "twelve billion, one hundred twenty-eight million, seven hundred sixty-one thousand, six hundred fifty-two".