12149523578 has 8 divisors (see below), whose sum is σ = 18238560372. Its totient is φ = 6070003456.

The previous prime is 12149523577. The next prime is 12149523629. The reversal of 12149523578 is 87532594121.

It can be written as a sum of positive squares in 2 ways, for example, as 11986527289 + 162996289 = 109483^2 + 12767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12149523578² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12149523577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2375975 + ... + 2381082.

Almost surely, 2^12149523578 is an apocalyptic number.

12149523578 is a deficient number, since it is larger than the sum of its proper divisors (6089036794).

12149523578 is a wasteful number, since it uses less digits than its factorization.

12149523578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4758336.

The product of its digits is 604800, while the sum is 47.

The spelling of 12149523578 in words is "twelve billion, one hundred forty-nine million, five hundred twenty-three thousand, five hundred seventy-eight".