66636497 has 8 divisors (see below), whose sum is σ = 70186176. Its totient is φ = 63141232.

The previous prime is 66636491. The next prime is 66636523. The reversal of 66636497 is 79463666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66636497 - 2¹⁶ = 66570961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66636491) 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, 11078 + ... + 15999.

It is an arithmetic number, because the mean of its divisors is an integer number (8773272).

Almost surely, 2^66636497 is an apocalyptic number.

It is an amenable number.

66636497 is a deficient number, since it is larger than the sum of its proper divisors (3549679).

66636497 is a wasteful number, since it uses less digits than its factorization.

66636497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27207.

The product of its digits is 979776, while the sum is 47.

The square root of 66636497 is about 8163.1180929838. The cubic root of 66636497 is about 405.4189578068.

The spelling of 66636497 in words is "sixty-six million, six hundred thirty-six thousand, four hundred ninety-seven".