161666064 has 160 divisors (see below), whose sum is σ = 535005440. Its totient is φ = 45785088.

The previous prime is 161666051. The next prime is 161666081. The reversal of 161666064 is 460666161.

It is a super-2 number, since 2×161666064² = 52271832498504192, which contains 22 as substring.

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

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, 583494 + ... + 583770.

It is an arithmetic number, because the mean of its divisors is an integer number (3343784).

Almost surely, 2^161666064 is an apocalyptic number.

161666064 is a gapful number since it is divisible by the number (14) 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 161666064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267502720).

161666064 is an abundant number, since it is smaller than the sum of its proper divisors (373339376).

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

161666064 is a wasteful number, since it uses less digits than its factorization.

161666064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 161666064 is about 12714.7970491078. The cubic root of 161666064 is about 544.7613510590.

It can be divided in two parts, 1 and 61666064, that added together give a triangular number (61666065 = T₁₁₁₀₅).

The spelling of 161666064 in words is "one hundred sixty-one million, six hundred sixty-six thousand, sixty-four".