660426223 has 4 divisors (see below), whose sum is σ = 660557800. Its totient is φ = 660294648.

The previous prime is 660426211. The next prime is 660426233. The reversal of 660426223 is 322624066.

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

It is a cyclic number.

It is not a de Polignac number, because 660426223 - 2²¹ = 658329071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660426203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57948 + ... + 68401.

It is an arithmetic number, because the mean of its divisors is an integer number (165139450).

Almost surely, 2^660426223 is an apocalyptic number.

660426223 is a deficient number, since it is larger than the sum of its proper divisors (131577).

660426223 is a wasteful number, since it uses less digits than its factorization.

660426223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131576.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 660426223 is about 25698.7591723803. The cubic root of 660426223 is about 870.8461503991.

The spelling of 660426223 in words is "six hundred sixty million, four hundred twenty-six thousand, two hundred twenty-three".