18669377653 has 2 divisors, whose sum is σ = 18669377654. Its totient is φ = 18669377652.

The previous prime is 18669377557. The next prime is 18669377669. The reversal of 18669377653 is 35677396681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9789519364 + 8879858289 = 98942^2 + 94233^2 .

It is a cyclic number.

It is not a de Polignac number, because 18669377653 - 2³³ = 10079443061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18669377591 and 18669377600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18669377053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9334688826 + 9334688827.

It is an arithmetic number, because the mean of its divisors is an integer number (9334688827).

Almost surely, 2^18669377653 is an apocalyptic number.

It is an amenable number.

18669377653 is a deficient number, since it is larger than the sum of its proper divisors (1).

18669377653 is an equidigital number, since it uses as much as digits as its factorization.

18669377653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 61.

The spelling of 18669377653 in words is "eighteen billion, six hundred sixty-nine million, three hundred seventy-seven thousand, six hundred fifty-three".