164391860560 has 20 divisors (see below), whose sum is σ = 382211075988. Its totient is φ = 65756744192.

The previous prime is 164391860557. The next prime is 164391860561. The reversal of 164391860560 is 65068193461.

It can be written as a sum of positive squares in 2 ways, for example, as 109180019776 + 55211840784 = 330424^2 + 234972^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164391860561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027449049 + ... + 1027449208.

Almost surely, 2^164391860560 is an apocalyptic number.

164391860560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164391860560 is an abundant number, since it is smaller than the sum of its proper divisors (217819215428).

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

164391860560 is a wasteful number, since it uses less digits than its factorization.

164391860560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054898270 (or 2054898264 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 164391860560 in words is "one hundred sixty-four billion, three hundred ninety-one million, eight hundred sixty thousand, five hundred sixty".