18590618915909 has 2 divisors, whose sum is σ = 18590618915910. Its totient is φ = 18590618915908.

The previous prime is 18590618915837. The next prime is 18590618915929. The reversal of 18590618915909 is 90951981609581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18251504863684 + 339114052225 = 4272178^2 + 582335^2 .

It is a cyclic number.

It is not a de Polignac number, because 18590618915909 - 2⁴⁴ = 998432871493 is a prime.

It is a super-2 number, since 2×18590618915909² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18590618915929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9295309457954 + 9295309457955.

It is an arithmetic number, because the mean of its divisors is an integer number (9295309457955).

Almost surely, 2^{18590618915909} is an apocalyptic number.

It is an amenable number.

18590618915909 is a deficient number, since it is larger than the sum of its proper divisors (1).

18590618915909 is an equidigital number, since it uses as much as digits as its factorization.

18590618915909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62985600, while the sum is 71.

The spelling of 18590618915909 in words is "eighteen trillion, five hundred ninety billion, six hundred eighteen million, nine hundred fifteen thousand, nine hundred nine".