1663859123 has 4 divisors (see below), whose sum is σ = 1736200848. Its totient is φ = 1591517400.

The previous prime is 1663859117. The next prime is 1663859149. The reversal of 1663859123 is 3219583661.

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 1663859123 - 2⁴ = 1663859107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663859023) 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 3 ways as a sum of consecutive naturals, for example, 36170828 + ... + 36170873.

It is an arithmetic number, because the mean of its divisors is an integer number (434050212).

Almost surely, 2^1663859123 is an apocalyptic number.

1663859123 is a deficient number, since it is larger than the sum of its proper divisors (72341725).

1663859123 is an equidigital number, since it uses as much as digits as its factorization.

1663859123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72341724.

The product of its digits is 233280, while the sum is 44.

The square root of 1663859123 is about 40790.4293063949. The cubic root of 1663859123 is about 1184.9649851084.

The spelling of 1663859123 in words is "one billion, six hundred sixty-three million, eight hundred fifty-nine thousand, one hundred twenty-three".