631444666 has 12 divisors (see below), whose sum is σ = 980956782. Its totient is φ = 304834544.

The previous prime is 631444657. The next prime is 631444717. The reversal of 631444666 is 666444136.

It can be written as a sum of positive squares in 3 ways, for example, as 368064225 + 263380441 = 19185^2 + 16229^2 .

It is a super-3 number, since 3×631444666³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186025 + ... + 189388.

Almost surely, 2^631444666 is an apocalyptic number.

631444666 is a deficient number, since it is larger than the sum of its proper divisors (349512116).

631444666 is a wasteful number, since it uses less digits than its factorization.

631444666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375473 (or 375444 counting only the distinct ones).

The product of its digits is 248832, while the sum is 40.

The square root of 631444666 is about 25128.5627523740. The cubic root of 631444666 is about 857.9166563072.

The spelling of 631444666 in words is "six hundred thirty-one million, four hundred forty-four thousand, six hundred sixty-six".