16563775347253 has 8 divisors (see below), whose sum is σ = 17542996328088. Its totient is φ = 15585096728064.

The previous prime is 16563775347239. The next prime is 16563775347271. The reversal of 16563775347253 is 35274357736561.

It can be written as a sum of positive squares in 4 ways, for example, as 2680155345924 + 13883620001329 = 1637118^2 + 3726073^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16563775347253 - 2¹³ = 16563775339061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16563775347293) 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, 135527526 + ... + 135649687.

It is an arithmetic number, because the mean of its divisors is an integer number (2192874541011).

Almost surely, 2^{16563775347253} is an apocalyptic number.

It is an amenable number.

16563775347253 is a deficient number, since it is larger than the sum of its proper divisors (979220980835).

16563775347253 is a wasteful number, since it uses less digits than its factorization.

16563775347253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271180823.

The product of its digits is 333396000, while the sum is 64.

The spelling of 16563775347253 in words is "sixteen trillion, five hundred sixty-three billion, seven hundred seventy-five million, three hundred forty-seven thousand, two hundred fifty-three".