161649360 has 60 divisors (see below), whose sum is σ = 542874852. Its totient is φ = 43106304.

The previous prime is 161649353. The next prime is 161649373. The reversal of 161649360 is 63946161.

161649360 is a `hidden beast` number, since 1 + 6 + 1 + 649 + 3 + 6 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 121352256 + 40297104 = 11016^2 + 6348^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×161649360² = 52261031176819200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 111537 + ... + 112976.

Almost surely, 2^161649360 is an apocalyptic number.

161649360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161649360 is an abundant number, since it is smaller than the sum of its proper divisors (381225492).

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

161649360 is a wasteful number, since it uses less digits than its factorization.

161649360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224532 (or 224523 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 161649360 is about 12714.1401596805. The cubic root of 161649360 is about 544.7425880880.

The spelling of 161649360 in words is "one hundred sixty-one million, six hundred forty-nine thousand, three hundred sixty".