12450155521 has 4 divisors (see below), whose sum is σ = 12450701872. Its totient is φ = 12449609172.

The previous prime is 12450155491. The next prime is 12450155537. The reversal of 12450155521 is 12555105421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12450155521 - 2⁹ = 12450155009 is a prime.

It is a super-3 number, since 3×12450155521³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12450155321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237435 + ... + 285088.

It is an arithmetic number, because the mean of its divisors is an integer number (3112675468).

Almost surely, 2^12450155521 is an apocalyptic number.

It is an amenable number.

12450155521 is a deficient number, since it is larger than the sum of its proper divisors (546351).

12450155521 is an equidigital number, since it uses as much as digits as its factorization.

12450155521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546350.

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 12450155521 in words is "twelve billion, four hundred fifty million, one hundred fifty-five thousand, five hundred twenty-one".