12545644654521 has 32 divisors (see below), whose sum is σ = 20503607241600. Its totient is φ = 7517989290240.

The previous prime is 12545644654511. The next prime is 12545644654531.

12545644654521 is a `hidden beast` number, since 1 + 2 + 5 + 4 + 5 + 64 + 4 + 6 + 54 + 521 = 666.

12545644654521 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (12545644654511) and next prime (12545644654531).

It is not a de Polignac number, because 12545644654521 - 2²³ = 12545636265913 is a prime.

It is a super-2 number, since 2×12545644654521² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12545644654511) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 237283836 + ... + 237336701.

It is an arithmetic number, because the mean of its divisors is an integer number (640737726300).

Almost surely, 2^{12545644654521} is an apocalyptic number.

12545644654521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12545644654521 is a deficient number, since it is larger than the sum of its proper divisors (7957962587079).

12545644654521 is a wasteful number, since it uses less digits than its factorization.

12545644654521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474620646 (or 474620640 counting only the distinct ones).

The product of its digits is 23040000, while the sum is 54.

The spelling of 12545644654521 in words is "twelve trillion, five hundred forty-five billion, six hundred forty-four million, six hundred fifty-four thousand, five hundred twenty-one".