1663921249 has 8 divisors (see below), whose sum is σ = 1757541632. Its totient is φ = 1572797520.

The previous prime is 1663921243. The next prime is 1663921253. The reversal of 1663921249 is 9421293661.

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

It is a cyclic number.

It is not a de Polignac number, because 1663921249 - 2¹³ = 1663913057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663921243) 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, 622794 + ... + 625459.

It is an arithmetic number, because the mean of its divisors is an integer number (219692704).

Almost surely, 2^1663921249 is an apocalyptic number.

It is an amenable number.

1663921249 is a deficient number, since it is larger than the sum of its proper divisors (93620383).

1663921249 is a wasteful number, since it uses less digits than its factorization.

1663921249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248327.

The product of its digits is 139968, while the sum is 43.

The square root of 1663921249 is about 40791.1908259614. The cubic root of 1663921249 is about 1184.9797331956.

The spelling of 1663921249 in words is "one billion, six hundred sixty-three million, nine hundred twenty-one thousand, two hundred forty-nine".