666722115 has 48 divisors (see below), whose sum is σ = 1222131456. Its totient is φ = 335692800.

The previous prime is 666722113. The next prime is 666722143. The reversal of 666722115 is 511227666.

It is a happy number.

It is not a de Polignac number, because 666722115 - 2¹ = 666722113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666722115.

It is not an unprimeable number, because it can be changed into a prime (666722113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51367 + ... + 63023.

It is an arithmetic number, because the mean of its divisors is an integer number (25461072).

Almost surely, 2^666722115 is an apocalyptic number.

666722115 is a deficient number, since it is larger than the sum of its proper divisors (555409341).

666722115 is a wasteful number, since it uses less digits than its factorization.

666722115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11740 (or 11737 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 666722115 is about 25820.9627047482. The cubic root of 666722115 is about 873.6046833553.

It can be divided in two parts, 6667 and 22115, that added together give a palindrome (28782).

The spelling of 666722115 in words is "six hundred sixty-six million, seven hundred twenty-two thousand, one hundred fifteen".