161138656 has 96 divisors (see below), whose sum is σ = 378302400. Its totient is φ = 67511808.

The previous prime is 161138633. The next prime is 161138671. The reversal of 161138656 is 656831161.

161138656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 581590 + ... + 581866.

It is an arithmetic number, because the mean of its divisors is an integer number (3940650).

Almost surely, 2^161138656 is an apocalyptic number.

161138656 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 161138656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189151200).

161138656 is an abundant number, since it is smaller than the sum of its proper divisors (217163744).

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

161138656 is an equidigital number, since it uses as much as digits as its factorization.

161138656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 339 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 161138656 is about 12694.0401763977. The cubic root of 161138656 is about 544.1683086481.

The spelling of 161138656 in words is "one hundred sixty-one million, one hundred thirty-eight thousand, six hundred fifty-six".