18385472761 has 2 divisors, whose sum is σ = 18385472762. Its totient is φ = 18385472760.

The previous prime is 18385472731. The next prime is 18385472771. The reversal of 18385472761 is 16727458381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10819952361 + 7565520400 = 104019^2 + 86980^2 .

It is a cyclic number.

It is not a de Polignac number, because 18385472761 - 2³¹ = 16237989113 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 18385472699 and 18385472708.

It is not a weakly prime, because it can be changed into another prime (18385472701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192736380 + 9192736381.

It is an arithmetic number, because the mean of its divisors is an integer number (9192736381).

Almost surely, 2^18385472761 is an apocalyptic number.

It is an amenable number.

18385472761 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385472761 is an equidigital number, since it uses as much as digits as its factorization.

18385472761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 52.

The spelling of 18385472761 in words is "eighteen billion, three hundred eighty-five million, four hundred seventy-two thousand, seven hundred sixty-one".