66637012 has 24 divisors (see below), whose sum is σ = 129918600. Its totient is φ = 29694336.

The previous prime is 66637007. The next prime is 66637031. The reversal of 66637012 is 21073666.

It can be written as a sum of positive squares in 4 ways, for example, as 1285956 + 65351056 = 1134^2 + 8084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20587 + ... + 23602.

It is an arithmetic number, because the mean of its divisors is an integer number (5413275).

Almost surely, 2^66637012 is an apocalyptic number.

It is an amenable number.

66637012 is a deficient number, since it is larger than the sum of its proper divisors (63281588).

66637012 is a wasteful number, since it uses less digits than its factorization.

66637012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44235 (or 44233 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66637012 is about 8163.1496372417. The cubic root of 66637012 is about 405.4200022306.

The spelling of 66637012 in words is "sixty-six million, six hundred thirty-seven thousand, twelve".