18945303121 has 4 divisors (see below), whose sum is σ = 18946254132. Its totient is φ = 18944352112.

The previous prime is 18945303109. The next prime is 18945303133. The reversal of 18945303121 is 12130354981.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18945303109) and next prime (18945303133).

It can be written as a sum of positive squares in 2 ways, for example, as 5203602496 + 13741700625 = 72136^2 + 117225^2 .

It is a cyclic number.

It is not a de Polignac number, because 18945303121 - 2²⁹ = 18408432209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18945303101) 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, 444970 + ... + 485683.

It is an arithmetic number, because the mean of its divisors is an integer number (4736563533).

Almost surely, 2^18945303121 is an apocalyptic number.

It is an amenable number.

18945303121 is a deficient number, since it is larger than the sum of its proper divisors (951011).

18945303121 is an equidigital number, since it uses as much as digits as its factorization.

18945303121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951010.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 18945303121 in words is "eighteen billion, nine hundred forty-five million, three hundred three thousand, one hundred twenty-one".