164404643 has 8 divisors (see below), whose sum is σ = 177232608. Its totient is φ = 151602624.

The previous prime is 164404633. The next prime is 164404649. The reversal of 164404643 is 346404461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164404643 is a prime.

It is a super-3 number, since 3×164404643³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164404649) 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, 7871 + ... + 19767.

It is an arithmetic number, because the mean of its divisors is an integer number (22154076).

Almost surely, 2^164404643 is an apocalyptic number.

164404643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

164404643 is a deficient number, since it is larger than the sum of its proper divisors (12827965).

164404643 is a wasteful number, since it uses less digits than its factorization.

164404643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 164404643 is about 12822.0373966075. The cubic root of 164404643 is about 547.8201798251.

The spelling of 164404643 in words is "one hundred sixty-four million, four hundred four thousand, six hundred forty-three".