18427499977 has 2 divisors, whose sum is σ = 18427499978. Its totient is φ = 18427499976.

The previous prime is 18427499969. The next prime is 18427500029. The reversal of 18427499977 is 77999472481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11735605561 + 6691894416 = 108331^2 + 81804^2 .

It is a cyclic number.

It is not a de Polignac number, because 18427499977 - 2³ = 18427499969 is a prime.

It is not a weakly prime, because it can be changed into another prime (18427199977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9213749988 + 9213749989.

It is an arithmetic number, because the mean of its divisors is an integer number (9213749989).

Almost surely, 2^18427499977 is an apocalyptic number.

It is an amenable number.

18427499977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18427499977 is an equidigital number, since it uses as much as digits as its factorization.

18427499977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64012032, while the sum is 67.

The spelling of 18427499977 in words is "eighteen billion, four hundred twenty-seven million, four hundred ninety-nine thousand, nine hundred seventy-seven".