161166564 has 96 divisors (see below), whose sum is σ = 453089280. Its totient is φ = 49248000.

The previous prime is 161166559. The next prime is 161166571. The reversal of 161166564 is 465661161.

It is a happy number.

161166564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161166564² = 51949322703132192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (25920) is a multiple of the sum of its prime divisors (810).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267864 + ... + 268464.

It is an arithmetic number, because the mean of its divisors is an integer number (4719680).

Almost surely, 2^161166564 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 161166564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226544640).

161166564 is an abundant number, since it is smaller than the sum of its proper divisors (291922716).

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

161166564 is a wasteful number, since it uses less digits than its factorization.

161166564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 810 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 161166564 is about 12695.1393848197. The cubic root of 161166564 is about 544.1997221171.

The spelling of 161166564 in words is "one hundred sixty-one million, one hundred sixty-six thousand, five hundred sixty-four".