164325621 has 16 divisors (see below), whose sum is σ = 238261824. Its totient is φ = 100318464.

The previous prime is 164325589. The next prime is 164325647. The reversal of 164325621 is 126523461.

It is not a de Polignac number, because 164325621 - 2⁵ = 164325589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164325671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41655 + ... + 45428.

It is an arithmetic number, because the mean of its divisors is an integer number (14891364).

Almost surely, 2^164325621 is an apocalyptic number.

It is an amenable number.

164325621 is a deficient number, since it is larger than the sum of its proper divisors (73936203).

164325621 is a wasteful number, since it uses less digits than its factorization.

164325621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87140.

The product of its digits is 8640, while the sum is 30.

The square root of 164325621 is about 12818.9555346760. The cubic root of 164325621 is about 547.7323948268.

The spelling of 164325621 in words is "one hundred sixty-four million, three hundred twenty-five thousand, six hundred twenty-one".