16506525641 has 4 divisors (see below), whose sum is σ = 16777124484. Its totient is φ = 16235926800.

The previous prime is 16506525617. The next prime is 16506525653. The reversal of 16506525641 is 14652560561.

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 4542760000 + 11963765641 = 67400^2 + 109379^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506525641 - 2²² = 16502331337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16506525601) 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, 135299330 + ... + 135299451.

It is an arithmetic number, because the mean of its divisors is an integer number (4194281121).

Almost surely, 2^16506525641 is an apocalyptic number.

It is an amenable number.

16506525641 is a deficient number, since it is larger than the sum of its proper divisors (270598843).

16506525641 is an equidigital number, since it uses as much as digits as its factorization.

16506525641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270598842.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 16506525641 in words is "sixteen billion, five hundred six million, five hundred twenty-five thousand, six hundred forty-one".