631666329 has 8 divisors (see below), whose sum is σ = 962539200. Its totient is φ = 360952176.

The previous prime is 631666307. The next prime is 631666333. The reversal of 631666329 is 923666136.

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

It is not a de Polignac number, because 631666329 - 2¹² = 631662233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631666129) 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, 15039654 + ... + 15039695.

It is an arithmetic number, because the mean of its divisors is an integer number (120317400).

Almost surely, 2^631666329 is an apocalyptic number.

It is an amenable number.

631666329 is a deficient number, since it is larger than the sum of its proper divisors (330872871).

631666329 is a wasteful number, since it uses less digits than its factorization.

631666329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30079359.

The product of its digits is 209952, while the sum is 42.

The square root of 631666329 is about 25132.9729439237. The cubic root of 631666329 is about 858.0170325513.

The spelling of 631666329 in words is "six hundred thirty-one million, six hundred sixty-six thousand, three hundred twenty-nine".