66505012 has 12 divisors (see below), whose sum is σ = 133010080. Its totient is φ = 28502136.

The previous prime is 66505009. The next prime is 66505027. The reversal of 66505012 is 21050566.

66505012 is an admirable number.

It is a super-2 number, since 2×66505012² = 8845833242240288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187562 + ... + 1187617.

Almost surely, 2^66505012 is an apocalyptic number.

It is an amenable number.

66505012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66505012 is a wasteful number, since it uses less digits than its factorization.

66505012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375190 (or 2375188 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 66505012 is about 8155.0605147969. The cubic root of 66505012 is about 405.1521289995.

Adding to 66505012 its reverse (21050566), we get a palindrome (87555578).

The spelling of 66505012 in words is "sixty-six million, five hundred five thousand, twelve".