1663238121 has 8 divisors (see below), whose sum is σ = 2218019520. Its totient is φ = 1108641072.

The previous prime is 1663238117. The next prime is 1663238153. The reversal of 1663238121 is 1218323661.

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

It is not a de Polignac number, because 1663238121 - 2² = 1663238117 is a prime.

It is a super-2 number, since 2×1663238121² = 5532722094295221282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1663238111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23445 + ... + 62258.

It is an arithmetic number, because the mean of its divisors is an integer number (277252440).

Almost surely, 2^1663238121 is an apocalyptic number.

It is an amenable number.

1663238121 is a deficient number, since it is larger than the sum of its proper divisors (554781399).

1663238121 is an equidigital number, since it uses as much as digits as its factorization.

1663238121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92175.

The product of its digits is 10368, while the sum is 33.

The square root of 1663238121 is about 40782.8164917530. The cubic root of 1663238121 is about 1184.8175453034.

The spelling of 1663238121 in words is "one billion, six hundred sixty-three million, two hundred thirty-eight thousand, one hundred twenty-one".