425957666 has 4 divisors (see below), whose sum is σ = 638936502. Its totient is φ = 212978832.

The previous prime is 425957657. The next prime is 425957669. The reversal of 425957666 is 666759524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 358307041 + 67650625 = 18929^2 + 8225^2 .

It is not an unprimeable number, because it can be changed into a prime (425957669) by changing a digit.

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 as a sum of consecutive naturals, namely, 106489415 + ... + 106489418.

Almost surely, 2^425957666 is an apocalyptic number.

425957666 is a deficient number, since it is larger than the sum of its proper divisors (212978836).

425957666 is a wasteful number, since it uses less digits than its factorization.

425957666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212978835.

The product of its digits is 2721600, while the sum is 50.

The square root of 425957666 is about 20638.7418705695. The cubic root of 425957666 is about 752.4115949315.

The spelling of 425957666 in words is "four hundred twenty-five million, nine hundred fifty-seven thousand, six hundred sixty-six".