12990206561 has 16 divisors (see below), whose sum is σ = 13597657920. Its totient is φ = 12398568000.

The previous prime is 12990206503. The next prime is 12990206629. The reversal of 12990206561 is 16560209921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12990206561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12990256561) 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, 560675 + ... + 583383.

It is an arithmetic number, because the mean of its divisors is an integer number (849853620).

Almost surely, 2^12990206561 is an apocalyptic number.

It is an amenable number.

12990206561 is a deficient number, since it is larger than the sum of its proper divisors (607451359).

12990206561 is a wasteful number, since it uses less digits than its factorization.

12990206561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23056.

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 12990206561 in words is "twelve billion, nine hundred ninety million, two hundred six thousand, five hundred sixty-one".