161493856 has 48 divisors (see below), whose sum is σ = 337478400. Its totient is φ = 75906688.

The previous prime is 161493851. The next prime is 161493877. The reversal of 161493856 is 658394161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161493851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41565 + ... + 45283.

It is an arithmetic number, because the mean of its divisors is an integer number (7030800).

Almost surely, 2^161493856 is an apocalyptic number.

161493856 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 161493856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168739200).

161493856 is an abundant number, since it is smaller than the sum of its proper divisors (175984544).

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

161493856 is a wasteful number, since it uses less digits than its factorization.

161493856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811 (or 3803 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 161493856 is about 12708.0232923929. The cubic root of 161493856 is about 544.5678542710.

The spelling of 161493856 in words is "one hundred sixty-one million, four hundred ninety-three thousand, eight hundred fifty-six".