18841630477 has 2 divisors, whose sum is σ = 18841630478. Its totient is φ = 18841630476.

The previous prime is 18841630447. The next prime is 18841630487. The reversal of 18841630477 is 77403614881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10009202116 + 8832428361 = 100046^2 + 93981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18841630477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18841630477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18841630427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9420815238 + 9420815239.

It is an arithmetic number, because the mean of its divisors is an integer number (9420815239).

Almost surely, 2^18841630477 is an apocalyptic number.

It is an amenable number.

18841630477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18841630477 is an equidigital number, since it uses as much as digits as its factorization.

18841630477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 49.

It can be divided in two parts, 1884 and 1630477, that added together give a palindrome (1632361).

The spelling of 18841630477 in words is "eighteen billion, eight hundred forty-one million, six hundred thirty thousand, four hundred seventy-seven".