64000181 has 16 divisors (see below), whose sum is σ = 74815488. Its totient is φ = 53617200.

The previous prime is 64000171. The next prime is 64000193. The reversal of 64000181 is 18100046.

It is not a de Polignac number, because 64000181 - 2⁶ = 64000117 is a prime.

It is a super-2 number, since 2×64000181² = 8192046336065522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64000171) 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, 64616 + ... + 65598.

It is an arithmetic number, because the mean of its divisors is an integer number (4675968).

Almost surely, 2^64000181 is an apocalyptic number.

It is an amenable number.

64000181 is a deficient number, since it is larger than the sum of its proper divisors (10815307).

64000181 is a wasteful number, since it uses less digits than its factorization.

64000181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 64000181 is about 8000.0113124920. The cubic root of 64000181 is about 400.0003770830. Note that the first 3 decimals are identical.

The spelling of 64000181 in words is "sixty-four million, one hundred eighty-one", and thus it is an aban number.