66207897 has 24 divisors (see below), whose sum is σ = 109865600. Its totient is φ = 37635840.

The previous prime is 66207893. The next prime is 66207919. The reversal of 66207897 is 79870266.

It is a happy number.

It is not a de Polignac number, because 66207897 - 2² = 66207893 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66207893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9897 + ... + 15177.

Almost surely, 2^66207897 is an apocalyptic number.

It is an amenable number.

66207897 is a deficient number, since it is larger than the sum of its proper divisors (43657703).

66207897 is a wasteful number, since it uses less digits than its factorization.

66207897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493 (or 5490 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 66207897 is about 8136.8235202688. The cubic root of 66207897 is about 404.5478813855.

The spelling of 66207897 in words is "sixty-six million, two hundred seven thousand, eight hundred ninety-seven".