12555921530 has 32 divisors (see below), whose sum is σ = 23090371920. Its totient is φ = 4914708480.

The previous prime is 12555921509. The next prime is 12555921541. The reversal of 12555921530 is 3512955521.

It can be written as a sum of positive squares in 8 ways, for example, as 341030089 + 12214891441 = 18467^2 + 110521^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13610 + ... + 159050.

Almost surely, 2^12555921530 is an apocalyptic number.

12555921530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12555921530 is a deficient number, since it is larger than the sum of its proper divisors (10534450390).

12555921530 is a wasteful number, since it uses less digits than its factorization.

12555921530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145634.

The product of its (nonzero) digits is 67500, while the sum is 38.

The spelling of 12555921530 in words is "twelve billion, five hundred fifty-five million, nine hundred twenty-one thousand, five hundred thirty".