66507020 has 12 divisors (see below), whose sum is σ = 139664784. Its totient is φ = 26602800.

The previous prime is 66507017. The next prime is 66507029. The reversal of 66507020 is 2070566.

It is not an unprimeable number, because it can be changed into a prime (66507029) 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, 1662656 + ... + 1662695.

It is an arithmetic number, because the mean of its divisors is an integer number (11638732).

Almost surely, 2^66507020 is an apocalyptic number.

It is an amenable number.

66507020 is an abundant number, since it is smaller than the sum of its proper divisors (73157764).

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

66507020 is a wasteful number, since it uses less digits than its factorization.

66507020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325360 (or 3325358 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 66507020 is about 8155.1836276077. The cubic root of 66507020 is about 405.1562065734.

Adding to 66507020 its reverse (2070566), we get a palindrome (68577586).

The spelling of 66507020 in words is "sixty-six million, five hundred seven thousand, twenty".