1663091247 has 8 divisors (see below), whose sum is σ = 2219444656. Its totient is φ = 1107732672.

The previous prime is 1663091237. The next prime is 1663091273. The reversal of 1663091247 is 7421903661.

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

It is not a de Polignac number, because 1663091247 - 2⁴ = 1663091231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663091237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244798 + ... + 251499.

It is an arithmetic number, because the mean of its divisors is an integer number (277430582).

Almost surely, 2^1663091247 is an apocalyptic number.

1663091247 is a deficient number, since it is larger than the sum of its proper divisors (556353409).

1663091247 is a wasteful number, since it uses less digits than its factorization.

1663091247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497417.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 1663091247 is about 40781.0157671434. The cubic root of 1663091247 is about 1184.7826687550.

The spelling of 1663091247 in words is "one billion, six hundred sixty-three million, ninety-one thousand, two hundred forty-seven".