161220060 has 36 divisors (see below), whose sum is σ = 489034728. Its totient is φ = 42991968.

The previous prime is 161220043. The next prime is 161220089. The reversal of 161220060 is 60022161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 447654 + ... + 448013.

It is an arithmetic number, because the mean of its divisors is an integer number (13584298).

Almost surely, 2^161220060 is an apocalyptic number.

161220060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161220060 is an abundant number, since it is smaller than the sum of its proper divisors (327814668).

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

161220060 is a wasteful number, since it uses less digits than its factorization.

161220060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895682 (or 895677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 161220060 is about 12697.2461581242. The cubic root of 161220060 is about 544.2599275077.

The spelling of 161220060 in words is "one hundred sixty-one million, two hundred twenty thousand, sixty".