16409688541 has 4 divisors (see below), whose sum is σ = 16975539900. Its totient is φ = 15843837184.

The previous prime is 16409688527. The next prime is 16409688557. The reversal of 16409688541 is 14588690461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10033027225 + 6376661316 = 100165^2 + 79854^2 .

It is a cyclic number.

It is not a de Polignac number, because 16409688541 - 2²⁹ = 15872817629 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 (16409688511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282925636 + ... + 282925693.

It is an arithmetic number, because the mean of its divisors is an integer number (4243884975).

Almost surely, 2^16409688541 is an apocalyptic number.

It is an amenable number.

16409688541 is a deficient number, since it is larger than the sum of its proper divisors (565851359).

16409688541 is an equidigital number, since it uses as much as digits as its factorization.

16409688541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565851358.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 16409688541 in words is "sixteen billion, four hundred nine million, six hundred eighty-eight thousand, five hundred forty-one".