66613512 has 32 divisors (see below), whose sum is σ = 190324800. Its totient is φ = 19032384.

The previous prime is 66613471. The next prime is 66613517. The reversal of 66613512 is 21531666.

It is a self number, because there is not a number n which added to its sum of digits gives 66613512.

It is not an unprimeable number, because it can be changed into a prime (66613517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198087 + ... + 198422.

It is an arithmetic number, because the mean of its divisors is an integer number (5947650).

Almost surely, 2^66613512 is an apocalyptic number.

It is an amenable number.

66613512 is an abundant number, since it is smaller than the sum of its proper divisors (123711288).

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

66613512 is a wasteful number, since it uses less digits than its factorization.

66613512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396525 (or 396521 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 66613512 is about 8161.7101149208. The cubic root of 66613512 is about 405.3723385777.

The spelling of 66613512 in words is "sixty-six million, six hundred thirteen thousand, five hundred twelve".