12505065664 has 56 divisors (see below), whose sum is σ = 30541232288. Its totient is φ = 4947056640.

The previous prime is 12505065607. The next prime is 12505065679. The reversal of 12505065664 is 46656050521.

It is a tau number, because it is divible by the number of its divisors (56).

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, 1067757 + ... + 1079404.

It is an arithmetic number, because the mean of its divisors is an integer number (545379148).

Almost surely, 2^12505065664 is an apocalyptic number.

12505065664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12505065664 is an abundant number, since it is smaller than the sum of its proper divisors (18036166624).

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

12505065664 is a wasteful number, since it uses less digits than its factorization.

12505065664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147193 (or 2147183 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 12505065664 in words is "twelve billion, five hundred five million, sixty-five thousand, six hundred sixty-four".