18818155357 has 2 divisors, whose sum is σ = 18818155358. Its totient is φ = 18818155356.

The previous prime is 18818155331. The next prime is 18818155373. The reversal of 18818155357 is 75355181881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13392507076 + 5425648281 = 115726^2 + 73659^2 .

It is a cyclic number.

It is not a de Polignac number, because 18818155357 - 2⁷ = 18818155229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18818158357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9409077678 + 9409077679.

It is an arithmetic number, because the mean of its divisors is an integer number (9409077679).

Almost surely, 2^18818155357 is an apocalyptic number.

It is an amenable number.

18818155357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18818155357 is an equidigital number, since it uses as much as digits as its factorization.

18818155357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344000, while the sum is 52.

The spelling of 18818155357 in words is "eighteen billion, eight hundred eighteen million, one hundred fifty-five thousand, three hundred fifty-seven".