1818273921253 has 2 divisors, whose sum is σ = 1818273921254. Its totient is φ = 1818273921252.

The previous prime is 1818273921173. The next prime is 1818273921271. The reversal of 1818273921253 is 3521293728181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1506331564929 + 311942356324 = 1227327^2 + 558518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818273921253 is a prime.

It is a super-2 number, since 2×1818273921253² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1818273921253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818273921293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909136960626 + 909136960627.

It is an arithmetic number, because the mean of its divisors is an integer number (909136960627).

Almost surely, 2^{1818273921253} is an apocalyptic number.

It is an amenable number.

1818273921253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818273921253 is an equidigital number, since it uses as much as digits as its factorization.

1818273921253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 52.

The spelling of 1818273921253 in words is "one trillion, eight hundred eighteen billion, two hundred seventy-three million, nine hundred twenty-one thousand, two hundred fifty-three".