18816969153137 has 2 divisors, whose sum is σ = 18816969153138. Its totient is φ = 18816969153136.

The previous prime is 18816969153107. The next prime is 18816969153187. The reversal of 18816969153137 is 73135196961881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18308052421681 + 508916731456 = 4278791^2 + 713384^2 .

It is an emirp because it is prime and its reverse (73135196961881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18816969153137 - 2⁸ = 18816969152881 is a prime.

It is a super-2 number, since 2×18816969153137² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18816969153107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9408484576568 + 9408484576569.

It is an arithmetic number, because the mean of its divisors is an integer number (9408484576569).

Almost surely, 2^{18816969153137} is an apocalyptic number.

It is an amenable number.

18816969153137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18816969153137 is an equidigital number, since it uses as much as digits as its factorization.

18816969153137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58786560, while the sum is 68.

The spelling of 18816969153137 in words is "eighteen trillion, eight hundred sixteen billion, nine hundred sixty-nine million, one hundred fifty-three thousand, one hundred thirty-seven".