18115757285537 has 4 divisors (see below), whose sum is σ = 18537053966640. Its totient is φ = 17694460604436.

The previous prime is 18115757285501. The next prime is 18115757285557. The reversal of 18115757285537 is 73558275751181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18115757285537 - 2¹² = 18115757281441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18115757285557) 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, 210648340487 + ... + 210648340572.

It is an arithmetic number, because the mean of its divisors is an integer number (4634263491660).

Almost surely, 2^{18115757285537} is an apocalyptic number.

It is an amenable number.

18115757285537 is a deficient number, since it is larger than the sum of its proper divisors (421296681103).

18115757285537 is an equidigital number, since it uses as much as digits as its factorization.

18115757285537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421296681102.

The product of its digits is 82320000, while the sum is 65.

The spelling of 18115757285537 in words is "eighteen trillion, one hundred fifteen billion, seven hundred fifty-seven million, two hundred eighty-five thousand, five hundred thirty-seven".