18414454477 has 2 divisors, whose sum is σ = 18414454478. Its totient is φ = 18414454476.

The previous prime is 18414454459. The next prime is 18414454493. The reversal of 18414454477 is 77445441481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15053817636 + 3360636841 = 122694^2 + 57971^2 .

It is a cyclic number.

It is not a de Polignac number, because 18414454477 - 2¹⁹ = 18413930189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18414454477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18414454577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9207227238 + 9207227239.

It is an arithmetic number, because the mean of its divisors is an integer number (9207227239).

Almost surely, 2^18414454477 is an apocalyptic number.

It is an amenable number.

18414454477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18414454477 is an equidigital number, since it uses as much as digits as its factorization.

18414454477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2007040, while the sum is 49.

The spelling of 18414454477 in words is "eighteen billion, four hundred fourteen million, four hundred fifty-four thousand, four hundred seventy-seven".