12051531550 has 12 divisors (see below), whose sum is σ = 22415848776. Its totient is φ = 4820612600.

The previous prime is 12051531533. The next prime is 12051531577. The reversal of 12051531550 is 5513515021.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120515266 + ... + 120515365.

It is an arithmetic number, because the mean of its divisors is an integer number (1867987398).

Almost surely, 2^12051531550 is an apocalyptic number.

12051531550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12051531550 is a deficient number, since it is larger than the sum of its proper divisors (10364317226).

12051531550 is a wasteful number, since it uses less digits than its factorization.

12051531550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241030643 (or 241030638 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 28.

The spelling of 12051531550 in words is "twelve billion, fifty-one million, five hundred thirty-one thousand, five hundred fifty".