18943624081157 has 2 divisors, whose sum is σ = 18943624081158. Its totient is φ = 18943624081156.

The previous prime is 18943624081033. The next prime is 18943624081229. The reversal of 18943624081157 is 75118042634981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17236397002276 + 1707227078881 = 4151674^2 + 1306609^2 .

It is a cyclic number.

It is not a de Polignac number, because 18943624081157 - 2¹⁴ = 18943624064773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18943624081096 and 18943624081105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18943624084157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471812040578 + 9471812040579.

It is an arithmetic number, because the mean of its divisors is an integer number (9471812040579).

It is a 1-persistent number, because it is pandigital, but 2⋅18943624081157 = 37887248162314 is not.

Almost surely, 2^{18943624081157} is an apocalyptic number.

It is an amenable number.

18943624081157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18943624081157 is an equidigital number, since it uses as much as digits as its factorization.

18943624081157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 18943624081157 in words is "eighteen trillion, nine hundred forty-three billion, six hundred twenty-four million, eighty-one thousand, one hundred fifty-seven".