20181818357 has 2 divisors, whose sum is σ = 20181818358. Its totient is φ = 20181818356.

The previous prime is 20181818347. The next prime is 20181818381. The reversal of 20181818357 is 75381818102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11828955121 + 8352863236 = 108761^2 + 91394^2 .

It is a cyclic number.

It is not a de Polignac number, because 20181818357 - 2¹⁰ = 20181817333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20181818347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10090909178 + 10090909179.

It is an arithmetic number, because the mean of its divisors is an integer number (10090909179).

Almost surely, 2^20181818357 is an apocalyptic number.

It is an amenable number.

20181818357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20181818357 is an equidigital number, since it uses as much as digits as its factorization.

20181818357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 44.

The spelling of 20181818357 in words is "twenty billion, one hundred eighty-one million, eight hundred eighteen thousand, three hundred fifty-seven".