18957628099 has 4 divisors (see below), whose sum is σ = 19469996464. Its totient is φ = 18445259736.

The previous prime is 18957628097. The next prime is 18957628127. The reversal of 18957628099 is 99082675981.

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 18957628099 - 2¹ = 18957628097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18957628099.

It is not an unprimeable number, because it can be changed into a prime (18957628097) 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 3 ways as a sum of consecutive naturals, for example, 256184127 + ... + 256184200.

It is an arithmetic number, because the mean of its divisors is an integer number (4867499116).

Almost surely, 2^18957628099 is an apocalyptic number.

18957628099 is a deficient number, since it is larger than the sum of its proper divisors (512368365).

18957628099 is an equidigital number, since it uses as much as digits as its factorization.

18957628099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512368364.

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 18957628099 in words is "eighteen billion, nine hundred fifty-seven million, six hundred twenty-eight thousand, ninety-nine".