164623641 has 32 divisors (see below), whose sum is σ = 271611648. Its totient is φ = 86365440.

The previous prime is 164623607. The next prime is 164623661. The reversal of 164623641 is 146326461.

It is not a de Polignac number, because 164623641 - 2¹¹ = 164621593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164623661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52251 + ... + 55311.

It is an arithmetic number, because the mean of its divisors is an integer number (8487864).

Almost surely, 2^164623641 is an apocalyptic number.

It is an amenable number.

164623641 is a deficient number, since it is larger than the sum of its proper divisors (106988007).

164623641 is a wasteful number, since it uses less digits than its factorization.

164623641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281.

The product of its digits is 20736, while the sum is 33.

The square root of 164623641 is about 12830.5744610286. The cubic root of 164623641 is about 548.0633162940.

The spelling of 164623641 in words is "one hundred sixty-four million, six hundred twenty-three thousand, six hundred forty-one".