12561214545 has 96 divisors (see below), whose sum is σ = 25678673280. Its totient is φ = 5613649920.

The previous prime is 12561214531. The next prime is 12561214559. The reversal of 12561214545 is 54541216521.

12561214545 is a `hidden beast` number, since 1 + 25 + 612 + 14 + 5 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (12561214531) and next prime (12561214559).

It is not a de Polignac number, because 12561214545 - 2⁹ = 12561214033 is a prime.

It is a super-2 number, since 2×12561214545² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 329937 + ... + 366033.

It is an arithmetic number, because the mean of its divisors is an integer number (267486180).

Almost surely, 2^12561214545 is an apocalyptic number.

12561214545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12561214545 is an abundant number, since it is smaller than the sum of its proper divisors (13117458735).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12561214545 is a wasteful number, since it uses less digits than its factorization.

12561214545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36175 (or 36172 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The spelling of 12561214545 in words is "twelve billion, five hundred sixty-one million, two hundred fourteen thousand, five hundred forty-five".