18938656567253 has 4 divisors (see below), whose sum is σ = 18938739071820. Its totient is φ = 18938574062688.

The previous prime is 18938656567241. The next prime is 18938656567279. The reversal of 18938656567253 is 35276565683981.

It is a happy number.

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 12272459284849 + 6666197282404 = 3503207^2 + 2581898^2 .

It is a cyclic number.

It is not a de Polignac number, because 18938656567253 - 2²⁰ = 18938655518677 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 (18938656567283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40907000 + ... + 41367377.

It is an arithmetic number, because the mean of its divisors is an integer number (4734684767955).

Almost surely, 2^{18938656567253} is an apocalyptic number.

It is an amenable number.

18938656567253 is a deficient number, since it is larger than the sum of its proper divisors (82504567).

18938656567253 is an equidigital number, since it uses as much as digits as its factorization.

18938656567253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82504566.

The product of its digits is 1959552000, while the sum is 74.

The spelling of 18938656567253 in words is "eighteen trillion, nine hundred thirty-eight billion, six hundred fifty-six million, five hundred sixty-seven thousand, two hundred fifty-three".