423666557 has 4 divisors (see below), whose sum is σ = 424773120. Its totient is φ = 422559996.

The previous prime is 423666517. The next prime is 423666587. The reversal of 423666557 is 755666324.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 423666557 - 2¹⁰ = 423665533 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 (423666517) 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, 552707 + ... + 553472.

It is an arithmetic number, because the mean of its divisors is an integer number (106193280).

Almost surely, 2^423666557 is an apocalyptic number.

It is an amenable number.

423666557 is a deficient number, since it is larger than the sum of its proper divisors (1106563).

423666557 is a wasteful number, since it uses less digits than its factorization.

423666557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106562.

The product of its digits is 907200, while the sum is 44.

The square root of 423666557 is about 20583.1619776943. The cubic root of 423666557 is about 751.0601641041.

The spelling of 423666557 in words is "four hundred twenty-three million, six hundred sixty-six thousand, five hundred fifty-seven".