161506776 has 64 divisors (see below), whose sum is σ = 428129280. Its totient is φ = 50682240.

The previous prime is 161506729. The next prime is 161506799. The reversal of 161506776 is 677605161.

161506776 is digitally balanced in base 3, 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, 24595 + ... + 30461.

It is an arithmetic number, because the mean of its divisors is an integer number (6689520).

Almost surely, 2^161506776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161506776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214064640).

161506776 is an abundant number, since it is smaller than the sum of its proper divisors (266622504).

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

161506776 is a wasteful number, since it uses less digits than its factorization.

161506776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5944 (or 5940 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 161506776 is about 12708.5316224968. The cubic root of 161506776 is about 544.5823762457.

The spelling of 161506776 in words is "one hundred sixty-one million, five hundred six thousand, seven hundred seventy-six".