16540163561 has 16 divisors (see below), whose sum is σ = 16840857600. Its totient is φ = 16242050448.

The previous prime is 16540163509. The next prime is 16540163569. The reversal of 16540163561 is 16536104561.

It is a cyclic number.

It is not a de Polignac number, because 16540163561 - 2¹⁴ = 16540147177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16540163569) 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, 18235670 + ... + 18236576.

It is an arithmetic number, because the mean of its divisors is an integer number (1052553600).

Almost surely, 2^16540163561 is an apocalyptic number.

It is an amenable number.

16540163561 is a deficient number, since it is larger than the sum of its proper divisors (300694039).

16540163561 is an equidigital number, since it uses as much as digits as its factorization.

16540163561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 16540163561 in words is "sixteen billion, five hundred forty million, one hundred sixty-three thousand, five hundred sixty-one".