161616008220 has 48 divisors (see below), whose sum is σ = 467122403328. Its totient is φ = 41707356480.

The previous prime is 161616008179. The next prime is 161616008273. The reversal of 161616008220 is 22800616161.

It is a super-2 number, since 2×161616008220² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43443304 + ... + 43447023.

It is an arithmetic number, because the mean of its divisors is an integer number (9731716736).

Almost surely, 2^161616008220 is an apocalyptic number.

161616008220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161616008220 is an abundant number, since it is smaller than the sum of its proper divisors (305506395108).

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

161616008220 is a wasteful number, since it uses less digits than its factorization.

161616008220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86890370 (or 86890368 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The spelling of 161616008220 in words is "one hundred sixty-one billion, six hundred sixteen million, eight thousand, two hundred twenty".