64180081 has 16 divisors (see below), whose sum is σ = 77608960. Its totient is φ = 51846480.

The previous prime is 64180073. The next prime is 64180091. The reversal of 64180081 is 18008146.

It is not a de Polignac number, because 64180081 - 2³ = 64180073 is a prime.

It is a super-2 number, since 2×64180081² = 8238165594333122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64180001) 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, 26920 + ... + 29206.

It is an arithmetic number, because the mean of its divisors is an integer number (4850560).

Almost surely, 2^64180081 is an apocalyptic number.

It is an amenable number.

64180081 is a deficient number, since it is larger than the sum of its proper divisors (13428879).

64180081 is a wasteful number, since it uses less digits than its factorization.

64180081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 64180081 is about 8011.2471563421. The cubic root of 64180081 is about 400.3748174201.

The spelling of 64180081 in words is "sixty-four million, one hundred eighty thousand, eighty-one".