12549145920 has 112 divisors (see below), whose sum is σ = 41575939200. Its totient is φ = 3200935936.

The previous prime is 12549145891. The next prime is 12549145927. The reversal of 12549145920 is 2954194521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12549145927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262095 + ... + 306254.

Almost surely, 2^12549145920 is an apocalyptic number.

12549145920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12549145920 is an abundant number, since it is smaller than the sum of its proper divisors (29026793280).

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

12549145920 is a wasteful number, since it uses less digits than its factorization.

12549145920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568392 (or 568382 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 12549145920 in words is "twelve billion, five hundred forty-nine million, one hundred forty-five thousand, nine hundred twenty".