1663699123 has 4 divisors (see below), whose sum is σ = 1663782120. Its totient is φ = 1663616128.

The previous prime is 1663699099. The next prime is 1663699171. The reversal of 1663699123 is 3219963661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1663699123 - 2⁹ = 1663698611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663699823) 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 3 ways as a sum of consecutive naturals, for example, 9288 + ... + 58426.

It is an arithmetic number, because the mean of its divisors is an integer number (415945530).

Almost surely, 2^1663699123 is an apocalyptic number.

1663699123 is a deficient number, since it is larger than the sum of its proper divisors (82997).

1663699123 is an equidigital number, since it uses as much as digits as its factorization.

1663699123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82996.

The product of its digits is 314928, while the sum is 46.

The square root of 1663699123 is about 40788.4680148691. The cubic root of 1663699123 is about 1184.9270010282.

The spelling of 1663699123 in words is "one billion, six hundred sixty-three million, six hundred ninety-nine thousand, one hundred twenty-three".