12505133550 has 96 divisors (see below), whose sum is σ = 38169556992. Its totient is φ = 2638442880.

The previous prime is 12505133521. The next prime is 12505133551. The reversal of 12505133550 is 5533150521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505133551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 444414 + ... + 471713.

It is an arithmetic number, because the mean of its divisors is an integer number (397599552).

Almost surely, 2^12505133550 is an apocalyptic number.

12505133550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12505133550 is an abundant number, since it is smaller than the sum of its proper divisors (25664423442).

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

12505133550 is a wasteful number, since it uses less digits than its factorization.

12505133550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916162 (or 916157 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 30.

The spelling of 12505133550 in words is "twelve billion, five hundred five million, one hundred thirty-three thousand, five hundred fifty".