66697636 has 12 divisors (see below), whose sum is σ = 117308800. Its totient is φ = 33180840.

The previous prime is 66697633. The next prime is 66697639. The reversal of 66697636 is 63679666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66697633) and next prime (66697639).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66697636.

It is not an unprimeable number, because it can be changed into a prime (66697633) 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, 41100 + ... + 42691.

Almost surely, 2^66697636 is an apocalyptic number.

It is an amenable number.

66697636 is a deficient number, since it is larger than the sum of its proper divisors (50611164).

66697636 is a wasteful number, since it uses less digits than its factorization.

66697636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83994 (or 83992 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 49.

The square root of 66697636 is about 8166.8620656896. The cubic root of 66697636 is about 405.5429105653.

The spelling of 66697636 in words is "sixty-six million, six hundred ninety-seven thousand, six hundred thirty-six".