18722018557 has 8 divisors (see below), whose sum is σ = 20758840992. Its totient is φ = 16740999600.

The previous prime is 18722018527. The next prime is 18722018569. The reversal of 18722018557 is 75581022781.

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

It is a cyclic number.

It is not a de Polignac number, because 18722018557 - 2¹⁹ = 18721494269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722018527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13950163 + ... + 13951504.

It is an arithmetic number, because the mean of its divisors is an integer number (2594855124).

Almost surely, 2^18722018557 is an apocalyptic number.

It is an amenable number.

18722018557 is a deficient number, since it is larger than the sum of its proper divisors (2036822435).

18722018557 is a wasteful number, since it uses less digits than its factorization.

18722018557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27901739.

The product of its (nonzero) digits is 313600, while the sum is 46.

The spelling of 18722018557 in words is "eighteen billion, seven hundred twenty-two million, eighteen thousand, five hundred fifty-seven".