161220471366 has 16 divisors (see below), whose sum is σ = 322489141488. Its totient is φ = 53732124000.

The previous prime is 161220471343. The next prime is 161220471421. The reversal of 161220471366 is 663174022161.

It is a happy number.

161220471366 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1964725 + ... + 2045136.

It is an arithmetic number, because the mean of its divisors is an integer number (20155571343).

Almost surely, 2^161220471366 is an apocalyptic number.

161220471366 is an abundant number, since it is smaller than the sum of its proper divisors (161268670122).

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

161220471366 is a wasteful number, since it uses less digits than its factorization.

161220471366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016567.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 161220471366 in words is "one hundred sixty-one billion, two hundred twenty million, four hundred seventy-one thousand, three hundred sixty-six".