66717201 has 4 divisors (see below), whose sum is σ = 88956272. Its totient is φ = 44478132.

The previous prime is 66717199. The next prime is 66717221. The reversal of 66717201 is 10271766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66717201 - 2¹ = 66717199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66717221) 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, 11119531 + ... + 11119536.

It is an arithmetic number, because the mean of its divisors is an integer number (22239068).

Almost surely, 2^66717201 is an apocalyptic number.

It is an amenable number.

66717201 is a deficient number, since it is larger than the sum of its proper divisors (22239071).

66717201 is a wasteful number, since it uses less digits than its factorization.

66717201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22239070.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 66717201 is about 8168.0598063432. The cubic root of 66717201 is about 405.5825605031.

Adding to 66717201 its reverse (10271766), we get a palindrome (76988967).

The spelling of 66717201 in words is "sixty-six million, seven hundred seventeen thousand, two hundred one".