631466663 has 4 divisors (see below), whose sum is σ = 634459608. Its totient is φ = 628473720.

The previous prime is 631466639. The next prime is 631466777. The reversal of 631466663 is 366664136.

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

It is a cyclic number.

It is not a de Polignac number, because 631466663 - 2¹⁴ = 631450279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631466663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631466603) 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, 1496156 + ... + 1496577.

It is an arithmetic number, because the mean of its divisors is an integer number (158614902).

Almost surely, 2^631466663 is an apocalyptic number.

631466663 is a deficient number, since it is larger than the sum of its proper divisors (2992945).

631466663 is a wasteful number, since it uses less digits than its factorization.

631466663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992944.

The product of its digits is 279936, while the sum is 41.

The square root of 631466663 is about 25129.0004377413. Note that the first 3 decimals coincide. The cubic root of 631466663 is about 857.9266183168.

The spelling of 631466663 in words is "six hundred thirty-one million, four hundred sixty-six thousand, six hundred sixty-three".