16561507201471 has 2 divisors, whose sum is σ = 16561507201472. Its totient is φ = 16561507201470.

The previous prime is 16561507201433. The next prime is 16561507201487. The reversal of 16561507201471 is 17410270516561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16561507201471 - 2²⁵ = 16561473647039 is a prime.

It is a super-3 number, since 3×16561507201471³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16561507208471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280753600735 + 8280753600736.

It is an arithmetic number, because the mean of its divisors is an integer number (8280753600736).

Almost surely, 2^{16561507201471} is an apocalyptic number.

16561507201471 is a deficient number, since it is larger than the sum of its proper divisors (1).

16561507201471 is an equidigital number, since it uses as much as digits as its factorization.

16561507201471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 16561507201471 in words is "sixteen trillion, five hundred sixty-one billion, five hundred seven million, two hundred one thousand, four hundred seventy-one".