18353891293 has 2 divisors, whose sum is σ = 18353891294. Its totient is φ = 18353891292.

The previous prime is 18353891291. The next prime is 18353891333. The reversal of 18353891293 is 39219835381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11342676004 + 7011215289 = 106502^2 + 83733^2 .

It is a cyclic number.

It is not a de Polignac number, because 18353891293 - 2¹ = 18353891291 is a prime.

It is a super-2 number, since 2×18353891293² (a number of 21 digits) contains 22 as substring.

Together with 18353891291, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18353891293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18353891291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9176945646 + 9176945647.

It is an arithmetic number, because the mean of its divisors is an integer number (9176945647).

Almost surely, 2^18353891293 is an apocalyptic number.

It is an amenable number.

18353891293 is a deficient number, since it is larger than the sum of its proper divisors (1).

18353891293 is an equidigital number, since it uses as much as digits as its factorization.

18353891293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The spelling of 18353891293 in words is "eighteen billion, three hundred fifty-three million, eight hundred ninety-one thousand, two hundred ninety-three".