66505404 has 48 divisors (see below), whose sum is σ = 177900800. Its totient is φ = 18942336.

The previous prime is 66505393. The next prime is 66505421. The reversal of 66505404 is 40450566.

It is a super-2 number, since 2×66505404² = 8845937522406432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30792 + ... + 32880.

Almost surely, 2^66505404 is an apocalyptic number.

It is an amenable number.

66505404 is an abundant number, since it is smaller than the sum of its proper divisors (111395396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66505404 is a wasteful number, since it uses less digits than its factorization.

66505404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482 (or 2480 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 66505404 is about 8155.0845489179. The cubic root of 66505404 is about 405.1529250264.

The spelling of 66505404 in words is "sixty-six million, five hundred five thousand, four hundred four".