18386743451 has 2 divisors, whose sum is σ = 18386743452. Its totient is φ = 18386743450.

The previous prime is 18386743439. The next prime is 18386743547. The reversal of 18386743451 is 15434768381.

It is a weak prime.

It is an emirp because it is prime and its reverse (15434768381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18386743451 - 2¹⁴ = 18386727067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18386743451.

It is not a weakly prime, because it can be changed into another prime (18386743751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9193371725 + 9193371726.

It is an arithmetic number, because the mean of its divisors is an integer number (9193371726).

Almost surely, 2^18386743451 is an apocalyptic number.

18386743451 is a deficient number, since it is larger than the sum of its proper divisors (1).

18386743451 is an equidigital number, since it uses as much as digits as its factorization.

18386743451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 50.

The spelling of 18386743451 in words is "eighteen billion, three hundred eighty-six million, seven hundred forty-three thousand, four hundred fifty-one".