18969473654213 has 2 divisors, whose sum is σ = 18969473654214. Its totient is φ = 18969473654212.

The previous prime is 18969473654107. The next prime is 18969473654221. The reversal of 18969473654213 is 31245637496981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18525087430084 + 444386224129 = 4304078^2 + 666623^2 .

It is a cyclic number.

It is not a de Polignac number, because 18969473654213 - 2¹² = 18969473650117 is a prime.

It is a super-2 number, since 2×18969473654213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18969473653213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9484736827106 + 9484736827107.

It is an arithmetic number, because the mean of its divisors is an integer number (9484736827107).

Almost surely, 2^{18969473654213} is an apocalyptic number.

It is an amenable number.

18969473654213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18969473654213 is an equidigital number, since it uses as much as digits as its factorization.

18969473654213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235146240, while the sum is 68.

The spelling of 18969473654213 in words is "eighteen trillion, nine hundred sixty-nine billion, four hundred seventy-three million, six hundred fifty-four thousand, two hundred thirteen".