161155020240 has 240 divisors, whose sum is σ = 559194494976. Its totient is φ = 41549414400.

The previous prime is 161155020223. The next prime is 161155020251. The reversal of 161155020240 is 42020551161.

161155020240 is a `hidden beast` number, since 1 + 6 + 115 + 502 + 0 + 2 + 40 = 666.

161155020240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29615920 + ... + 29621360.

Almost surely, 2^161155020240 is an apocalyptic number.

161155020240 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 161155020240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279597247488).

161155020240 is an abundant number, since it is smaller than the sum of its proper divisors (398039474736).

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

161155020240 is a wasteful number, since it uses less digits than its factorization.

161155020240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6818 (or 6809 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 161155020240 in words is "one hundred sixty-one billion, one hundred fifty-five million, twenty thousand, two hundred forty".