161049378816 has 320 divisors, whose sum is σ = 491770445760. Its totient is φ = 52500234240.

The previous prime is 161049378799. The next prime is 161049378817. The reversal of 161049378816 is 618873940161.

161049378816 is a `hidden beast` number, since 1 + 6 + 1 + 0 + 493 + 78 + 81 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (161049378817) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 124747131 + ... + 124748421.

It is an arithmetic number, because the mean of its divisors is an integer number (1536782643).

Almost surely, 2^161049378816 is an apocalyptic number.

161049378816 is a gapful number since it is divisible by the number (16) 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 161049378816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245885222880).

161049378816 is an abundant number, since it is smaller than the sum of its proper divisors (330721066944).

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

161049378816 is an frugal number, since it uses more digits than its factorization.

161049378816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 161049378816 in words is "one hundred sixty-one billion, forty-nine million, three hundred seventy-eight thousand, eight hundred sixteen".