425666321 has 8 divisors (see below), whose sum is σ = 440722920. Its totient is φ = 410635008.

The previous prime is 425666287. The next prime is 425666323. The reversal of 425666321 is 123666524.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 330330625 + 95335696 = 18175^2 + 9764^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 425666321 - 2⁶ = 425666257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425666323) 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, 31955 + ... + 43271.

It is an arithmetic number, because the mean of its divisors is an integer number (55090365).

Almost surely, 2^425666321 is an apocalyptic number.

It is an amenable number.

425666321 is a deficient number, since it is larger than the sum of its proper divisors (15056599).

425666321 is a wasteful number, since it uses less digits than its factorization.

425666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12643.

The product of its digits is 51840, while the sum is 35.

The square root of 425666321 is about 20631.6824568429. The cubic root of 425666321 is about 752.2400118760.

The spelling of 425666321 in words is "four hundred twenty-five million, six hundred sixty-six thousand, three hundred twenty-one".