423666551 has 16 divisors (see below), whose sum is σ = 537166080. Its totient is φ = 324530880.

The previous prime is 423666517. The next prime is 423666587. The reversal of 423666551 is 155666324.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 423666551 - 2¹⁰ = 423665527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423666251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42086 + ... + 51171.

It is an arithmetic number, because the mean of its divisors is an integer number (33572880).

Almost surely, 2^423666551 is an apocalyptic number.

423666551 is a deficient number, since it is larger than the sum of its proper divisors (113499529).

423666551 is a wasteful number, since it uses less digits than its factorization.

423666551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93334.

The product of its digits is 129600, while the sum is 38.

The square root of 423666551 is about 20583.1618319441. The cubic root of 423666551 is about 751.0601605585.

The spelling of 423666551 in words is "four hundred twenty-three million, six hundred sixty-six thousand, five hundred fifty-one".