16506015541 has 4 divisors (see below), whose sum is σ = 16508820492. Its totient is φ = 16503210592.

The previous prime is 16506015509. The next prime is 16506015563. The reversal of 16506015541 is 14551060561.

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 15657516900 + 848498641 = 125130^2 + 29129^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506015541 - 2⁵ = 16506015509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16506015497 and 16506015506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506015571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393630 + ... + 1405423.

It is an arithmetic number, because the mean of its divisors is an integer number (4127205123).

Almost surely, 2^16506015541 is an apocalyptic number.

It is an amenable number.

16506015541 is a deficient number, since it is larger than the sum of its proper divisors (2804951).

16506015541 is an equidigital number, since it uses as much as digits as its factorization.

16506015541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804950.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 16506015541 in words is "sixteen billion, five hundred six million, fifteen thousand, five hundred forty-one".