64666005 has 16 divisors (see below), whose sum is σ = 103583040. Its totient is φ = 34449408.

The previous prime is 64665971. The next prime is 64666009. The reversal of 64666005 is 50066646.

It is not a de Polignac number, because 64666005 - 2⁶ = 64665941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64666009) 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, 15426 + ... + 19164.

It is an arithmetic number, because the mean of its divisors is an integer number (6473940).

Almost surely, 2^64666005 is an apocalyptic number.

It is an amenable number.

64666005 is a deficient number, since it is larger than the sum of its proper divisors (38917035).

64666005 is a wasteful number, since it uses less digits than its factorization.

64666005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 64666005 is about 8041.5175806560. The cubic root of 64666005 is about 401.3827250873.

The spelling of 64666005 in words is "sixty-four million, six hundred sixty-six thousand, five".