66513012 has 24 divisors (see below), whose sum is σ = 155496096. Its totient is φ = 22128288.

The previous prime is 66512989. The next prime is 66513017. The reversal of 66513012 is 21031566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66513017) 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, 1498 + ... + 11630.

It is an arithmetic number, because the mean of its divisors is an integer number (6479004).

Almost surely, 2^66513012 is an apocalyptic number.

It is an amenable number.

66513012 is an abundant number, since it is smaller than the sum of its proper divisors (88983084).

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

66513012 is a wasteful number, since it uses less digits than its factorization.

66513012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10687 (or 10685 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66513012 is about 8155.5509930354. The cubic root of 66513012 is about 405.1683738257.

Adding to 66513012 its reverse (21031566), we get a palindrome (87544578).

The spelling of 66513012 in words is "sixty-six million, five hundred thirteen thousand, twelve".