18272536557 has 8 divisors (see below), whose sum is σ = 26578235040. Its totient is φ = 11074264560.

The previous prime is 18272536439. The next prime is 18272536571. The reversal of 18272536557 is 75563527281.

It is a happy number.

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

It is not a de Polignac number, because 18272536557 - 2¹⁵ = 18272503789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272536577) 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, 276856582 + ... + 276856647.

It is an arithmetic number, because the mean of its divisors is an integer number (3322279380).

Almost surely, 2^18272536557 is an apocalyptic number.

It is an amenable number.

18272536557 is a deficient number, since it is larger than the sum of its proper divisors (8305698483).

18272536557 is a wasteful number, since it uses less digits than its factorization.

18272536557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553713243.

The product of its digits is 3528000, while the sum is 51.

The spelling of 18272536557 in words is "eighteen billion, two hundred seventy-two million, five hundred thirty-six thousand, five hundred fifty-seven".