16563772340261 has 8 divisors (see below), whose sum is σ = 16690354296000. Its totient is φ = 16437192520320.

The previous prime is 16563772340249. The next prime is 16563772340263. The reversal of 16563772340261 is 16204327736561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16563772340261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16563772340263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17303960 + ... + 18236078.

It is an arithmetic number, because the mean of its divisors is an integer number (2086294287000).

Almost surely, 2^{16563772340261} is an apocalyptic number.

It is an amenable number.

16563772340261 is a deficient number, since it is larger than the sum of its proper divisors (126581955739).

16563772340261 is a wasteful number, since it uses less digits than its factorization.

16563772340261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067899.

The product of its (nonzero) digits is 7620480, while the sum is 53.

The spelling of 16563772340261 in words is "sixteen trillion, five hundred sixty-three billion, seven hundred seventy-two million, three hundred forty thousand, two hundred sixty-one".