164621816432 has 80 divisors (see below), whose sum is σ = 337222895520. Its totient is φ = 77851238400.

The previous prime is 164621816423. The next prime is 164621816453. The reversal of 164621816432 is 234618126461.

It is a super-2 number, since 2×164621816432² (a number of 23 digits) contains 22 as substring.

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, 126534182 + ... + 126535482.

It is an arithmetic number, because the mean of its divisors is an integer number (4215286194).

Almost surely, 2^164621816432 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 164621816432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168611447760).

164621816432 is an abundant number, since it is smaller than the sum of its proper divisors (172601079088).

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

164621816432 is a wasteful number, since it uses less digits than its factorization.

164621816432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519 (or 2475 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The spelling of 164621816432 in words is "one hundred sixty-four billion, six hundred twenty-one million, eight hundred sixteen thousand, four hundred thirty-two".