66506012 has 6 divisors (see below), whose sum is σ = 116385528. Its totient is φ = 33253004.

The previous prime is 66505997. The next prime is 66506017. The reversal of 66506012 is 21060566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66506017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8313248 + ... + 8313255.

It is an arithmetic number, because the mean of its divisors is an integer number (19397588).

Almost surely, 2^66506012 is an apocalyptic number.

It is an amenable number.

66506012 is a deficient number, since it is larger than the sum of its proper divisors (49879516).

66506012 is a wasteful number, since it uses less digits than its factorization.

66506012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16626507 (or 16626505 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 66506012 is about 8155.1218261900. The cubic root of 66506012 is about 405.1541596741.

Adding to 66506012 its reverse (21060566), we get a palindrome (87566578).

The spelling of 66506012 in words is "sixty-six million, five hundred six thousand, twelve".