12129578536 has 8 divisors (see below), whose sum is σ = 22742959770. Its totient is φ = 6064789264.

The previous prime is 12129578521. The next prime is 12129578579. The reversal of 12129578536 is 63587592121.

It can be written as a sum of positive squares in only one way, i.e., 7957710436 + 4171868100 = 89206^2 + 64590^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 12129578536.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758098651 + ... + 758098666.

Almost surely, 2^12129578536 is an apocalyptic number.

It is an amenable number.

12129578536 is a deficient number, since it is larger than the sum of its proper divisors (10613381234).

12129578536 is a wasteful number, since it uses less digits than its factorization.

12129578536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516197323 (or 1516197319 counting only the distinct ones).

The product of its digits is 907200, while the sum is 49.

The spelling of 12129578536 in words is "twelve billion, one hundred twenty-nine million, five hundred seventy-eight thousand, five hundred thirty-six".