12521505445545 has 16 divisors (see below), whose sum is σ = 20042299442880. Its totient is φ = 6675505994304.

The previous prime is 12521505445507. The next prime is 12521505445601. The reversal of 12521505445545 is 54554450512521.

It is a happy number.

It is not a de Polignac number, because 12521505445545 - 2¹¹ = 12521505443497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12521505445494 and 12521505445503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164350854 + ... + 164427023.

It is an arithmetic number, because the mean of its divisors is an integer number (1252643715180).

Almost surely, 2^{12521505445545} is an apocalyptic number.

12521505445545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12521505445545 is a deficient number, since it is larger than the sum of its proper divisors (7520793997335).

12521505445545 is a wasteful number, since it uses less digits than its factorization.

12521505445545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328780424.

The product of its (nonzero) digits is 4000000, while the sum is 48.

The spelling of 12521505445545 in words is "twelve trillion, five hundred twenty-one billion, five hundred five million, four hundred forty-five thousand, five hundred forty-five".