425581666 has 8 divisors (see below), whose sum is σ = 638470224. Its totient is φ = 212758260.

The previous prime is 425581657. The next prime is 425581669. The reversal of 425581666 is 666185524.

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

It is a super-2 number, since 2×425581666² = 362239508870671112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (425581669) 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, 6321 + ... + 29851.

It is an arithmetic number, because the mean of its divisors is an integer number (79808778).

Almost surely, 2^425581666 is an apocalyptic number.

425581666 is a deficient number, since it is larger than the sum of its proper divisors (212888558).

425581666 is a wasteful number, since it uses less digits than its factorization.

425581666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32576.

The product of its digits is 345600, while the sum is 43.

The square root of 425581666 is about 20629.6307771128. The cubic root of 425581666 is about 752.1901409661.

The spelling of 425581666 in words is "four hundred twenty-five million, five hundred eighty-one thousand, six hundred sixty-six".