64081663 has 8 divisors (see below), whose sum is σ = 65465136. Its totient is φ = 62712000.

The previous prime is 64081649. The next prime is 64081679. The reversal of 64081663 is 36618046.

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

It is a cyclic number.

It is not a de Polignac number, because 64081663 - 2⁵ = 64081631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64081603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6213 + ... + 12913.

It is an arithmetic number, because the mean of its divisors is an integer number (8183142).

Almost surely, 2^64081663 is an apocalyptic number.

64081663 is a deficient number, since it is larger than the sum of its proper divisors (1383473).

64081663 is a wasteful number, since it uses less digits than its factorization.

64081663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 64081663 is about 8005.1023104018. The cubic root of 64081663 is about 400.1700589396.

The spelling of 64081663 in words is "sixty-four million, eighty-one thousand, six hundred sixty-three".