660222806 has 4 divisors (see below), whose sum is σ = 990334212. Its totient is φ = 330111402.

The previous prime is 660222799. The next prime is 660222809. The reversal of 660222806 is 608222066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608222066 = 2 ⋅304111033.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660222809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165055700 + ... + 165055703.

It is an arithmetic number, because the mean of its divisors is an integer number (247583553).

Almost surely, 2^660222806 is an apocalyptic number.

660222806 is a deficient number, since it is larger than the sum of its proper divisors (330111406).

660222806 is a wasteful number, since it uses less digits than its factorization.

660222806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330111405.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 660222806 is about 25694.8011473138. The cubic root of 660222806 is about 870.7567318308.

The spelling of 660222806 in words is "six hundred sixty million, two hundred twenty-two thousand, eight hundred six".