16520221695 has 16 divisors (see below), whose sum is σ = 26434769760. Its totient is φ = 8809979904.

The previous prime is 16520221673. The next prime is 16520221787. The reversal of 16520221695 is 59612202561.

It is not a de Polignac number, because 16520221695 - 2¹¹ = 16520219647 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 143391 + ... + 231519.

It is an arithmetic number, because the mean of its divisors is an integer number (1652173110).

Almost surely, 2^16520221695 is an apocalyptic number.

16520221695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16520221695 is a deficient number, since it is larger than the sum of its proper divisors (9914548065).

16520221695 is a wasteful number, since it uses less digits than its factorization.

16520221695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100634.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 16520221695 in words is "sixteen billion, five hundred twenty million, two hundred twenty-one thousand, six hundred ninety-five".