1663381099 has 4 divisors (see below), whose sum is σ = 1761227064. Its totient is φ = 1565535136.

The previous prime is 1663381079. The next prime is 1663381127. The reversal of 1663381099 is 9901833661.

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 1663381099 - 2⁵ = 1663381067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1663381009) 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, 48922957 + ... + 48922990.

It is an arithmetic number, because the mean of its divisors is an integer number (440306766).

Almost surely, 2^1663381099 is an apocalyptic number.

1663381099 is a deficient number, since it is larger than the sum of its proper divisors (97845965).

1663381099 is an equidigital number, since it uses as much as digits as its factorization.

1663381099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97845964.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 1663381099 is about 40784.5693737227. The cubic root of 1663381099 is about 1184.8514947396.

The spelling of 1663381099 in words is "one billion, six hundred sixty-three million, three hundred eighty-one thousand, ninety-nine".