18623943077 has 2 divisors, whose sum is σ = 18623943078. Its totient is φ = 18623943076.

The previous prime is 18623943049. The next prime is 18623943103. The reversal of 18623943077 is 77034932681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17819313121 + 804629956 = 133489^2 + 28366^2 .

It is a cyclic number.

It is not a de Polignac number, because 18623943077 - 2¹⁶ = 18623877541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18623973077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9311971538 + 9311971539.

It is an arithmetic number, because the mean of its divisors is an integer number (9311971539).

Almost surely, 2^18623943077 is an apocalyptic number.

It is an amenable number.

18623943077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18623943077 is an equidigital number, since it uses as much as digits as its factorization.

18623943077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 18623943077 in words is "eighteen billion, six hundred twenty-three million, nine hundred forty-three thousand, seventy-seven".