18503090107 has 4 divisors (see below), whose sum is σ = 18511907400. Its totient is φ = 18494272816.

The previous prime is 18503090087. The next prime is 18503090141. The reversal of 18503090107 is 70109030581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70109030581 = 63397 ⋅1105873.

It is a cyclic number.

It is not a de Polignac number, because 18503090107 - 2²³ = 18494701499 is a prime.

It is a super-2 number, since 2×18503090107² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18503390107) 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, 4405498 + ... + 4409695.

It is an arithmetic number, because the mean of its divisors is an integer number (4627976850).

Almost surely, 2^18503090107 is an apocalyptic number.

18503090107 is a deficient number, since it is larger than the sum of its proper divisors (8817293).

18503090107 is an equidigital number, since it uses as much as digits as its factorization.

18503090107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8817292.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 18503090107 in words is "eighteen billion, five hundred three million, ninety thousand, one hundred seven".