12545521555 has 16 divisors (see below), whose sum is σ = 17366088960. Its totient is φ = 8522242272.

The previous prime is 12545521529. The next prime is 12545521567. The reversal of 12545521555 is 55512554521.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12545521555 is a prime.

It is a super-2 number, since 2×12545521555² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1671225 + ... + 1678714.

It is an arithmetic number, because the mean of its divisors is an integer number (1085380560).

Almost surely, 2^12545521555 is an apocalyptic number.

12545521555 is a deficient number, since it is larger than the sum of its proper divisors (4820567405).

12545521555 is a wasteful number, since it uses less digits than its factorization.

12545521555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3350058.

The product of its digits is 250000, while the sum is 40.

The spelling of 12545521555 in words is "twelve billion, five hundred forty-five million, five hundred twenty-one thousand, five hundred fifty-five".