12555021545 has 32 divisors (see below), whose sum is σ = 16985465856. Its totient is φ = 8826163200.

The previous prime is 12555021511. The next prime is 12555021553. The reversal of 12555021545 is 54512055521.

It is not a de Polignac number, because 12555021545 - 2⁶ = 12555021481 is a prime.

It is a Duffinian 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 31 ways as a sum of consecutive naturals, for example, 1662017 + ... + 1669553.

It is an arithmetic number, because the mean of its divisors is an integer number (530795808).

Almost surely, 2^12555021545 is an apocalyptic number.

It is an amenable number.

12555021545 is a deficient number, since it is larger than the sum of its proper divisors (4430444311).

12555021545 is a wasteful number, since it uses less digits than its factorization.

12555021545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8561.

The product of its (nonzero) digits is 50000, while the sum is 35.

The spelling of 12555021545 in words is "twelve billion, five hundred fifty-five million, twenty-one thousand, five hundred forty-five".