164646993 has 16 divisors (see below), whose sum is σ = 255144960. Its totient is φ = 92488656.

The previous prime is 164646919. The next prime is 164646997. The reversal of 164646993 is 399646461.

It is not a de Polignac number, because 164646993 - 2⁹ = 164646481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164646997) 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, 65205 + ... + 67682.

It is an arithmetic number, because the mean of its divisors is an integer number (15946560).

Almost surely, 2^164646993 is an apocalyptic number.

It is an amenable number.

164646993 is a deficient number, since it is larger than the sum of its proper divisors (90497967).

164646993 is a wasteful number, since it uses less digits than its factorization.

164646993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132956.

The product of its digits is 839808, while the sum is 48.

The square root of 164646993 is about 12831.4844425733. The cubic root of 164646993 is about 548.0892294807.

The spelling of 164646993 in words is "one hundred sixty-four million, six hundred forty-six thousand, nine hundred ninety-three".