1663543695 has 64 divisors (see below), whose sum is σ = 2961262080. Its totient is φ = 797322240.

The previous prime is 1663543691. The next prime is 1663543699. The reversal of 1663543695 is 5963453661.

It is an interprime number because it is at equal distance from previous prime (1663543691) and next prime (1663543699).

It is not a de Polignac number, because 1663543695 - 2² = 1663543691 is a prime.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663543691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1936176 + ... + 1937034.

It is an arithmetic number, because the mean of its divisors is an integer number (46269720).

Almost surely, 2^1663543695 is an apocalyptic number.

1663543695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1663543695 is a deficient number, since it is larger than the sum of its proper divisors (1297718385).

1663543695 is an equidigital number, since it uses as much as digits as its factorization.

1663543695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 975 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 48.

The square root of 1663543695 is about 40786.5626769406. The cubic root of 1663543695 is about 1184.8901000110.

The spelling of 1663543695 in words is "one billion, six hundred sixty-three million, five hundred forty-three thousand, six hundred ninety-five".