660688222 has 4 divisors (see below), whose sum is σ = 991032336. Its totient is φ = 330344110.

The previous prime is 660688219. The next prime is 660688229. The reversal of 660688222 is 222886066.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660688229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165172054 + ... + 165172057.

It is an arithmetic number, because the mean of its divisors is an integer number (247758084).

Almost surely, 2^660688222 is an apocalyptic number.

660688222 is a deficient number, since it is larger than the sum of its proper divisors (330344114).

660688222 is a wasteful number, since it uses less digits than its factorization.

660688222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330344113.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 660688222 is about 25703.8561698435. The cubic root of 660688222 is about 870.9612935434.

The spelling of 660688222 in words is "six hundred sixty million, six hundred eighty-eight thousand, two hundred twenty-two".