66503512 has 16 divisors (see below), whose sum is σ = 125393400. Its totient is φ = 33065280.

The previous prime is 66503483. The next prime is 66503513. The reversal of 66503512 is 21530566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66503513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21789 + ... + 24652.

Almost surely, 2^66503512 is an apocalyptic number.

It is an amenable number.

66503512 is a deficient number, since it is larger than the sum of its proper divisors (58889888).

66503512 is a wasteful number, since it uses less digits than its factorization.

66503512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46626 (or 46622 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66503512 is about 8154.9685468431. The cubic root of 66503512 is about 405.1490829496.

The spelling of 66503512 in words is "sixty-six million, five hundred three thousand, five hundred twelve".