164401647 has 16 divisors (see below), whose sum is σ = 221598720. Its totient is φ = 108409952.

The previous prime is 164401613. The next prime is 164401681. The reversal of 164401647 is 746104461.

It is an interprime number because it is at equal distance from previous prime (164401613) and next prime (164401681).

It is a cyclic number.

It is not a de Polignac number, because 164401647 - 2⁶ = 164401583 is a prime.

It is a super-3 number, since 3×164401647³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164401247) 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, 119053 + ... + 120425.

It is an arithmetic number, because the mean of its divisors is an integer number (13849920).

Almost surely, 2^164401647 is an apocalyptic number.

164401647 is a deficient number, since it is larger than the sum of its proper divisors (57197073).

164401647 is a wasteful number, since it uses less digits than its factorization.

164401647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 164401647 is about 12821.9205659683. The cubic root of 164401647 is about 547.8168521023.

The spelling of 164401647 in words is "one hundred sixty-four million, four hundred one thousand, six hundred forty-seven".