161456220 has 48 divisors (see below), whose sum is σ = 502309920. Its totient is φ = 43054848.

The previous prime is 161456219. The next prime is 161456249. The reversal of 161456220 is 22654161.

161456220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161456220² = 52136221953376800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148957 + ... + 150036.

It is an arithmetic number, because the mean of its divisors is an integer number (10464790).

Almost surely, 2^161456220 is an apocalyptic number.

161456220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161456220 is an abundant number, since it is smaller than the sum of its proper divisors (340853700).

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

161456220 is a wasteful number, since it uses less digits than its factorization.

161456220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299011 (or 299003 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 161456220 is about 12706.5424093260. The cubic root of 161456220 is about 544.5255472991.

The spelling of 161456220 in words is "one hundred sixty-one million, four hundred fifty-six thousand, two hundred twenty".