161012405120 has 128 divisors (see below), whose sum is σ = 440160143040. Its totient is φ = 55172726784.

The previous prime is 161012405111. The next prime is 161012405137. The reversal of 161012405120 is 21504210161.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8650544 + ... + 8669136.

Almost surely, 2^161012405120 is an apocalyptic number.

161012405120 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 161012405120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220080071520).

161012405120 is an abundant number, since it is smaller than the sum of its proper divisors (279147737920).

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

161012405120 is a wasteful number, since it uses less digits than its factorization.

161012405120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20552 (or 20540 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 161012405120 its reverse (21504210161), we get a palindrome (182516615281).

The spelling of 161012405120 in words is "one hundred sixty-one billion, twelve million, four hundred five thousand, one hundred twenty".