16561507201401 has 8 divisors (see below), whose sum is σ = 22084471674720. Its totient is φ = 11039773764512.

The previous prime is 16561507201373. The next prime is 16561507201433. The reversal of 16561507201401 is 10410270516561.

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 16561507201401 - 2¹¹ = 16561507199353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16561507201401.

It is not an unprimeable number, because it can be changed into a prime (16561507201471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307727715 + ... + 307781528.

It is an arithmetic number, because the mean of its divisors is an integer number (2760558959340).

Almost surely, 2^{16561507201401} is an apocalyptic number.

It is an amenable number.

16561507201401 is a deficient number, since it is larger than the sum of its proper divisors (5522964473319).

16561507201401 is an equidigital number, since it uses as much as digits as its factorization.

16561507201401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615518215.

The product of its (nonzero) digits is 50400, while the sum is 39.

Adding to 16561507201401 its reverse (10410270516561), we get a palindrome (26971777717962).

The spelling of 16561507201401 in words is "sixteen trillion, five hundred sixty-one billion, five hundred seven million, two hundred one thousand, four hundred one".