18610816986353 has 4 divisors (see below), whose sum is σ = 18611074323828. Its totient is φ = 18610559648880.

The previous prime is 18610816986337. The next prime is 18610816986379. The reversal of 18610816986353 is 35368961801681.

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 15020182345744 + 3590634640609 = 3875588^2 + 1894897^2 .

It is a cyclic number.

It is not a de Polignac number, because 18610816986353 - 2⁴ = 18610816986337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18610816986353.

It is not an unprimeable number, because it can be changed into a prime (18610816986383) 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, 128560226 + ... + 128704907.

It is an arithmetic number, because the mean of its divisors is an integer number (4652768580957).

Almost surely, 2^{18610816986353} is an apocalyptic number.

It is an amenable number.

18610816986353 is a deficient number, since it is larger than the sum of its proper divisors (257337475).

18610816986353 is an equidigital number, since it uses as much as digits as its factorization.

18610816986353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257337474.

The product of its (nonzero) digits is 44789760, while the sum is 65.

The spelling of 18610816986353 in words is "eighteen trillion, six hundred ten billion, eight hundred sixteen million, nine hundred eighty-six thousand, three hundred fifty-three".