66695560 has 16 divisors (see below), whose sum is σ = 150065100. Its totient is φ = 26678208.

The previous prime is 66695543. The next prime is 66695569. The reversal of 66695560 is 6559666.

It can be written as a sum of positive squares in 2 ways, for example, as 56340036 + 10355524 = 7506^2 + 3218^2 .

It is not an unprimeable number, because it can be changed into a prime (66695569) 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, 833655 + ... + 833734.

Almost surely, 2^66695560 is an apocalyptic number.

It is an amenable number.

66695560 is an abundant number, since it is smaller than the sum of its proper divisors (83369540).

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

66695560 is a wasteful number, since it uses less digits than its factorization.

66695560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667400 (or 1667396 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 43.

The square root of 66695560 is about 8166.7349657008. The cubic root of 66695560 is about 405.5387029409.

The spelling of 66695560 in words is "sixty-six million, six hundred ninety-five thousand, five hundred sixty".