66721202 has 16 divisors (see below), whose sum is σ = 101073312. Its totient is φ = 33032160.

The previous prime is 66721177. The next prime is 66721261. The reversal of 66721202 is 20212766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127313 + ... + 127835.

It is an arithmetic number, because the mean of its divisors is an integer number (6317082).

Almost surely, 2^66721202 is an apocalyptic number.

66721202 is a deficient number, since it is larger than the sum of its proper divisors (34352110).

66721202 is a wasteful number, since it uses less digits than its factorization.

66721202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 66721202 is about 8168.3047200750. The cubic root of 66721202 is about 405.5906678745.

Adding to 66721202 its reverse (20212766), we get a palindrome (86933968).

The spelling of 66721202 in words is "sixty-six million, seven hundred twenty-one thousand, two hundred two".