164521774464 has 32 divisors (see below), whose sum is σ = 437010964440. Its totient is φ = 54840591360.

The previous prime is 164521774457. The next prime is 164521774493. The reversal of 164521774464 is 464477125461.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214220677 + ... + 214221444.

Almost surely, 2^164521774464 is an apocalyptic number.

It is an amenable number.

164521774464 is an abundant number, since it is smaller than the sum of its proper divisors (272489189976).

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

164521774464 is an equidigital number, since it uses as much as digits as its factorization.

164521774464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428442138 (or 428442126 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 51.

The spelling of 164521774464 in words is "one hundred sixty-four billion, five hundred twenty-one million, seven hundred seventy-four thousand, four hundred sixty-four".