66995688 has 32 divisors (see below), whose sum is σ = 174772800. Its totient is φ = 21360768.

The previous prime is 66995683. The next prime is 66995693. The reversal of 66995688 is 88659966.

It is an interprime number because it is at equal distance from previous prime (66995683) and next prime (66995693).

It is not an unprimeable number, because it can be changed into a prime (66995683) 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, 60133 + ... + 61236.

It is an arithmetic number, because the mean of its divisors is an integer number (5461650).

Almost surely, 2^66995688 is an apocalyptic number.

It is an amenable number.

66995688 is an abundant number, since it is smaller than the sum of its proper divisors (107777112).

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

66995688 is a wasteful number, since it uses less digits than its factorization.

66995688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121401 (or 121397 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 57.

The square root of 66995688 is about 8185.0893703123. The cubic root of 66995688 is about 406.1460967256.

The spelling of 66995688 in words is "sixty-six million, nine hundred ninety-five thousand, six hundred eighty-eight".