164521445 has 8 divisors (see below), whose sum is σ = 215373600. Its totient is φ = 119651920.

The previous prime is 164521417. The next prime is 164521447. The reversal of 164521445 is 544125461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164521445 - 2¹² = 164517349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164521447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495595 + ... + 1495704.

It is an arithmetic number, because the mean of its divisors is an integer number (26921700).

Almost surely, 2^164521445 is an apocalyptic number.

It is an amenable number.

164521445 is a deficient number, since it is larger than the sum of its proper divisors (50852155).

164521445 is a wasteful number, since it uses less digits than its factorization.

164521445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991315.

The product of its digits is 19200, while the sum is 32.

The square root of 164521445 is about 12826.5913242763. The cubic root of 164521445 is about 547.9498828641.

The spelling of 164521445 in words is "one hundred sixty-four million, five hundred twenty-one thousand, four hundred forty-five".