18213702757 has 4 divisors (see below), whose sum is σ = 18557357580. Its totient is φ = 17870047936.

The previous prime is 18213702733. The next prime is 18213702761. The reversal of 18213702757 is 75720731281.

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 8671148161 + 9542554596 = 93119^2 + 97686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18213702757 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 (18213702797) 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, 171827332 + ... + 171827437.

It is an arithmetic number, because the mean of its divisors is an integer number (4639339395).

Almost surely, 2^18213702757 is an apocalyptic number.

It is an amenable number.

18213702757 is a deficient number, since it is larger than the sum of its proper divisors (343654823).

18213702757 is an equidigital number, since it uses as much as digits as its factorization.

18213702757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343654822.

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 18213702757 in words is "eighteen billion, two hundred thirteen million, seven hundred two thousand, seven hundred fifty-seven".