18595140497 has 4 divisors (see below), whose sum is σ = 18596134116. Its totient is φ = 18594146880.

The previous prime is 18595140491. The next prime is 18595140511. The reversal of 18595140497 is 79404159581.

It is a Cunningham number, because it is equal to 136364²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3131969296 + 15463171201 = 55964^2 + 124351^2 .

It is a cyclic number.

It is not a de Polignac number, because 18595140497 - 2⁸ = 18595140241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18595140491) 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, 468188 + ... + 506349.

It is an arithmetic number, because the mean of its divisors is an integer number (4649033529).

Almost surely, 2^18595140497 is an apocalyptic number.

It is an amenable number.

18595140497 is a deficient number, since it is larger than the sum of its proper divisors (993619).

18595140497 is an equidigital number, since it uses as much as digits as its factorization.

18595140497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993618.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 18595140497 in words is "eighteen billion, five hundred ninety-five million, one hundred forty thousand, four hundred ninety-seven".