18553994707 has 4 divisors (see below), whose sum is σ = 18985483000. Its totient is φ = 18122506416.

The previous prime is 18553994689. The next prime is 18553994743. The reversal of 18553994707 is 70749935581.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18553994707 is a prime.

It is a super-3 number, since 3×18553994707³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18553998707) 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, 215744082 + ... + 215744167.

It is an arithmetic number, because the mean of its divisors is an integer number (4746370750).

Almost surely, 2^18553994707 is an apocalyptic number.

18553994707 is a deficient number, since it is larger than the sum of its proper divisors (431488293).

18553994707 is an equidigital number, since it uses as much as digits as its factorization.

18553994707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431488292.

The product of its (nonzero) digits is 9525600, while the sum is 58.

The spelling of 18553994707 in words is "eighteen billion, five hundred fifty-three million, nine hundred ninety-four thousand, seven hundred seven".