66630560 has 24 divisors (see below), whose sum is σ = 157415076. Its totient is φ = 26652160.

The previous prime is 66630559. The next prime is 66630569. The reversal of 66630560 is 6503666.

It can be written as a sum of positive squares in 2 ways, for example, as 66520336 + 110224 = 8156^2 + 332^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (66630569) 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, 208061 + ... + 208380.

Almost surely, 2^66630560 is an apocalyptic number.

It is an amenable number.

66630560 is an abundant number, since it is smaller than the sum of its proper divisors (90784516).

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

66630560 is a wasteful number, since it uses less digits than its factorization.

66630560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416456 (or 416448 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 66630560 is about 8162.7544370758. The cubic root of 66630560 is about 405.4069171387.

The spelling of 66630560 in words is "sixty-six million, six hundred thirty thousand, five hundred sixty".