20161803964164 has 12 divisors (see below), whose sum is σ = 47044209249744. Its totient is φ = 6720601321384.

The previous prime is 20161803964111. The next prime is 20161803964201. The reversal of 20161803964164 is 46146930816102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840075165162 + ... + 840075165185.

It is an arithmetic number, because the mean of its divisors is an integer number (3920350770812).

Almost surely, 2^{20161803964164} is an apocalyptic number.

It is an amenable number.

20161803964164 is an abundant number, since it is smaller than the sum of its proper divisors (26882405285580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20161803964164 is a wasteful number, since it uses less digits than its factorization.

20161803964164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680150330354 (or 1680150330352 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 20161803964164 in words is "twenty trillion, one hundred sixty-one billion, eight hundred three million, nine hundred sixty-four thousand, one hundred sixty-four".