161654320 has 20 divisors (see below), whose sum is σ = 375846480. Its totient is φ = 64661696.

The previous prime is 161654279. The next prime is 161654321. The reversal of 161654320 is 23456161.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×161654320² = 52264238349324800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161654321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010260 + ... + 1010419.

It is an arithmetic number, because the mean of its divisors is an integer number (18792324).

Almost surely, 2^161654320 is an apocalyptic number.

161654320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161654320 is an abundant number, since it is smaller than the sum of its proper divisors (214192160).

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

161654320 is a wasteful number, since it uses less digits than its factorization.

161654320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020692 (or 2020686 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 161654320 is about 12714.3352165971. The cubic root of 161654320 is about 544.7481596032.

It can be divided in two parts, 161 and 654320, that added together give a square (654481 = 809²).

The spelling of 161654320 in words is "one hundred sixty-one million, six hundred fifty-four thousand, three hundred twenty".