66388201201 has 8 divisors (see below), whose sum is σ = 77420643200. Its totient is φ = 56904172164.

The previous prime is 66388201171. The next prime is 66388201241. The reversal of 66388201201 is 10210288366.

It is a happy number.

It is not a de Polignac number, because 66388201201 - 2¹³ = 66388193009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66388201241) 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, 96775461 + ... + 96776146.

It is an arithmetic number, because the mean of its divisors is an integer number (9677580400).

Almost surely, 2^66388201201 is an apocalyptic number.

It is an amenable number.

66388201201 is a deficient number, since it is larger than the sum of its proper divisors (11032441999).

66388201201 is an equidigital number, since it uses as much as digits as its factorization.

66388201201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193551628 (or 193551614 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

Adding to 66388201201 its reverse (10210288366), we get a palindrome (76598489567).

The spelling of 66388201201 in words is "sixty-six billion, three hundred eighty-eight million, two hundred one thousand, two hundred one".