12521406061664 has 48 divisors (see below), whose sum is σ = 25504947861120. Its totient is φ = 6044016168960.

The previous prime is 12521406061651. The next prime is 12521406061771. The reversal of 12521406061664 is 46616060412521.

It is a super-3 number, since 3×12521406061664³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6147344 + ... + 7926704.

It is an arithmetic number, because the mean of its divisors is an integer number (531353080440).

Almost surely, 2^{12521406061664} is an apocalyptic number.

It is an amenable number.

12521406061664 is an abundant number, since it is smaller than the sum of its proper divisors (12983541799456).

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

12521406061664 is a wasteful number, since it uses less digits than its factorization.

12521406061664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786983 (or 1786975 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 12521406061664 in words is "twelve trillion, five hundred twenty-one billion, four hundred six million, sixty-one thousand, six hundred sixty-four".