423656661 has 8 divisors (see below), whose sum is σ = 594605920. Its totient is φ = 267572592.

The previous prime is 423656659. The next prime is 423656669. The reversal of 423656661 is 166656324.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 423656661 - 2¹ = 423656659 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 (423656669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3716230 + ... + 3716343.

It is an arithmetic number, because the mean of its divisors is an integer number (74325740).

Almost surely, 2^423656661 is an apocalyptic number.

It is an amenable number.

423656661 is a deficient number, since it is larger than the sum of its proper divisors (170949259).

423656661 is a wasteful number, since it uses less digits than its factorization.

423656661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7432595.

The product of its digits is 155520, while the sum is 39.

The square root of 423656661 is about 20582.9215856253. The cubic root of 423656661 is about 751.0543163061.

The spelling of 423656661 in words is "four hundred twenty-three million, six hundred fifty-six thousand, six hundred sixty-one".