161354664 has 24 divisors (see below), whose sum is σ = 437002410. Its totient is φ = 53784864.

The previous prime is 161354663. The next prime is 161354681. The reversal of 161354664 is 466453161.

It is a happy number.

161354664 is a `hidden beast` number, since 161 + 35 + 466 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 95062500 + 66292164 = 9750^2 + 8142^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161354663) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1120447 + ... + 1120590.

Almost surely, 2^161354664 is an apocalyptic number.

It is an amenable number.

161354664 is an abundant number, since it is smaller than the sum of its proper divisors (275647746).

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

161354664 is a wasteful number, since it uses less digits than its factorization.

161354664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241049 (or 2241042 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 161354664 is about 12702.5455716561. The cubic root of 161354664 is about 544.4113544546.

The spelling of 161354664 in words is "one hundred sixty-one million, three hundred fifty-four thousand, six hundred sixty-four".