16506146161 has 4 divisors (see below), whose sum is σ = 16715084800. Its totient is φ = 16297207524.

The previous prime is 16506146149. The next prime is 16506146201. The reversal of 16506146161 is 16164160561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16164160561 = 73 ⋅221426857.

It is a cyclic number.

It is not a de Polignac number, because 16506146161 - 2²³ = 16497757553 is a prime.

It is a super-2 number, since 2×16506146161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16506146161.

It is not an unprimeable number, because it can be changed into a prime (16506116161) 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, 104469201 + ... + 104469358.

It is an arithmetic number, because the mean of its divisors is an integer number (4178771200).

Almost surely, 2^16506146161 is an apocalyptic number.

It is an amenable number.

16506146161 is a deficient number, since it is larger than the sum of its proper divisors (208938639).

16506146161 is an equidigital number, since it uses as much as digits as its factorization.

16506146161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208938638.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 16506146161 in words is "sixteen billion, five hundred six million, one hundred forty-six thousand, one hundred sixty-one".