1663143631 has 4 divisors (see below), whose sum is σ = 1672757352. Its totient is φ = 1653529912.

The previous prime is 1663143619. The next prime is 1663143641. The reversal of 1663143631 is 1363413661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1363413661 = 1741 ⋅783121.

It is a cyclic number.

It is not a de Polignac number, because 1663143631 - 2¹⁵ = 1663110863 is a prime.

It is a super-2 number, since 2×1663143631² = 5532093474671728322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663143641) 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, 4806601 + ... + 4806946.

It is an arithmetic number, because the mean of its divisors is an integer number (418189338).

Almost surely, 2^1663143631 is an apocalyptic number.

1663143631 is a deficient number, since it is larger than the sum of its proper divisors (9613721).

1663143631 is an equidigital number, since it uses as much as digits as its factorization.

1663143631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9613720.

The product of its digits is 23328, while the sum is 34.

The square root of 1663143631 is about 40781.6580217136. The cubic root of 1663143631 is about 1184.7951080411.

The spelling of 1663143631 in words is "one billion, six hundred sixty-three million, one hundred forty-three thousand, six hundred thirty-one".