164644643632 has 60 divisors (see below), whose sum is σ = 371213423856. Its totient is φ = 70536708480.

The previous prime is 164644643617. The next prime is 164644643633. The reversal of 164644643632 is 236346446461.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (164644643633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2239782 + ... + 2312122.

Almost surely, 2^164644643632 is an apocalyptic number.

It is an amenable number.

164644643632 is an abundant number, since it is smaller than the sum of its proper divisors (206568780224).

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

164644643632 is a wasteful number, since it uses less digits than its factorization.

164644643632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75266 (or 75253 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 49.

The spelling of 164644643632 in words is "one hundred sixty-four billion, six hundred forty-four million, six hundred forty-three thousand, six hundred thirty-two".