425021665 has 8 divisors (see below), whose sum is σ = 510268968. Its totient is φ = 339855360.

The previous prime is 425021633. The next prime is 425021671. The reversal of 425021665 is 566120524.

It can be written as a sum of positive squares in 4 ways, for example, as 152078224 + 272943441 = 12332^2 + 16521^2 .

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

It is not a de Polignac number, because 425021665 - 2⁵ = 425021633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8032 + ... + 30241.

It is an arithmetic number, because the mean of its divisors is an integer number (63783621).

Almost surely, 2^425021665 is an apocalyptic number.

It is an amenable number.

425021665 is a deficient number, since it is larger than the sum of its proper divisors (85247303).

425021665 is a wasteful number, since it uses less digits than its factorization.

425021665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40499.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 425021665 is about 20616.0535748237. The cubic root of 425021665 is about 751.8600733926.

The spelling of 425021665 in words is "four hundred twenty-five million, twenty-one thousand, six hundred sixty-five".