66604005 has 32 divisors (see below), whose sum is σ = 127518720. Its totient is φ = 32788800.

The previous prime is 66604003. The next prime is 66604019. The reversal of 66604005 is 50040666.

It is not a de Polignac number, because 66604005 - 2¹ = 66604003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 66604005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17221 + ... + 20730.

It is an arithmetic number, because the mean of its divisors is an integer number (3984960).

Almost surely, 2^66604005 is an apocalyptic number.

66604005 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66604005 is a deficient number, since it is larger than the sum of its proper divisors (60914715).

66604005 is a wasteful number, since it uses less digits than its factorization.

66604005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37978 (or 37972 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66604005 is about 8161.1276794325. The cubic root of 66604005 is about 405.3530529100.

The spelling of 66604005 in words is "sixty-six million, six hundred four thousand, five".