12564520386081 has 16 divisors (see below), whose sum is σ = 17481177907200. Its totient is φ = 8012109314000.

The previous prime is 12564520386079. The next prime is 12564520386133. The reversal of 12564520386081 is 18068302546521.

It is a cyclic number.

It is not a de Polignac number, because 12564520386081 - 2¹ = 12564520386079 is a prime.

It is a super-2 number, since 2×12564520386081² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12564520386281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13458706 + ... + 14361956.

It is an arithmetic number, because the mean of its divisors is an integer number (1092573619200).

Almost surely, 2^{12564520386081} is an apocalyptic number.

It is an amenable number.

12564520386081 is a deficient number, since it is larger than the sum of its proper divisors (4916657521119).

12564520386081 is a wasteful number, since it uses less digits than its factorization.

12564520386081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104876.

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 12564520386081 in words is "twelve trillion, five hundred sixty-four billion, five hundred twenty million, three hundred eighty-six thousand, eighty-one".