18974456129 has 2 divisors, whose sum is σ = 18974456130. Its totient is φ = 18974456128.

The previous prime is 18974456117. The next prime is 18974456147. The reversal of 18974456129 is 92165447981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18457939600 + 516516529 = 135860^2 + 22727^2 .

It is a cyclic number.

It is not a de Polignac number, because 18974456129 - 2⁴ = 18974456113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18974452129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487228064 + 9487228065.

It is an arithmetic number, because the mean of its divisors is an integer number (9487228065).

Almost surely, 2^18974456129 is an apocalyptic number.

It is an amenable number.

18974456129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974456129 is an equidigital number, since it uses as much as digits as its factorization.

18974456129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The spelling of 18974456129 in words is "eighteen billion, nine hundred seventy-four million, four hundred fifty-six thousand, one hundred twenty-nine".