18667774040813 has 2 divisors, whose sum is σ = 18667774040814. Its totient is φ = 18667774040812.

The previous prime is 18667774040803. The next prime is 18667774040911. The reversal of 18667774040813 is 31804047776681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16598152290889 + 2069621749924 = 4074083^2 + 1438618^2 .

It is a cyclic number.

It is not a de Polignac number, because 18667774040813 - 2³² = 18663479073517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18667774040803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9333887020406 + 9333887020407.

It is an arithmetic number, because the mean of its divisors is an integer number (9333887020407).

Almost surely, 2^{18667774040813} is an apocalyptic number.

It is an amenable number.

18667774040813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18667774040813 is an equidigital number, since it uses as much as digits as its factorization.

18667774040813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37933056, while the sum is 62.

The spelling of 18667774040813 in words is "eighteen trillion, six hundred sixty-seven billion, seven hundred seventy-four million, forty thousand, eight hundred thirteen".