161553240 has 96 divisors (see below), whose sum is σ = 526752720. Its totient is φ = 42941184.

The previous prime is 161553233. The next prime is 161553263. The reversal of 161553240 is 42355161.

161553240 is a `hidden beast` number, since 1 + 615 + 5 + 3 + 2 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158974 + ... + 159986.

Almost surely, 2^161553240 is an apocalyptic number.

161553240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161553240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263376360).

161553240 is an abundant number, since it is smaller than the sum of its proper divisors (365199480).

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

161553240 is a wasteful number, since it uses less digits than its factorization.

161553240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473 (or 1466 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 161553240 is about 12710.3595543163. The cubic root of 161553240 is about 544.6345950030.

The spelling of 161553240 in words is "one hundred sixty-one million, five hundred fifty-three thousand, two hundred forty".