16505220220071 has 32 divisors (see below), whose sum is σ = 26039799668736. Its totient is φ = 9185114496000.

The previous prime is 16505220220063. The next prime is 16505220220079. The reversal of 16505220220071 is 17002202250561.

It is an interprime number because it is at equal distance from previous prime (16505220220063) and next prime (16505220220079).

It is not a de Polignac number, because 16505220220071 - 2³ = 16505220220063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505220220079) 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 31 ways as a sum of consecutive naturals, for example, 358770535 + ... + 358816536.

It is an arithmetic number, because the mean of its divisors is an integer number (813743739648).

Almost surely, 2^{16505220220071} is an apocalyptic number.

16505220220071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16505220220071 is a deficient number, since it is larger than the sum of its proper divisors (9534579448665).

16505220220071 is a wasteful number, since it uses less digits than its factorization.

16505220220071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717587143.

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 16505220220071 in words is "sixteen trillion, five hundred five billion, two hundred twenty million, two hundred twenty thousand, seventy-one".