161500664 has 64 divisors (see below), whose sum is σ = 344010240. Its totient is φ = 70519680.

The previous prime is 161500657. The next prime is 161500711. The reversal of 161500664 is 466005161.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255629 + ... + 256259.

It is an arithmetic number, because the mean of its divisors is an integer number (5375160).

Almost surely, 2^161500664 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 161500664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172005120).

161500664 is an abundant number, since it is smaller than the sum of its proper divisors (182509576).

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

161500664 is a wasteful number, since it uses less digits than its factorization.

161500664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 161500664 is about 12708.2911518426. The cubic root of 161500664 is about 544.5755065041.

The spelling of 161500664 in words is "one hundred sixty-one million, five hundred thousand, six hundred sixty-four".