11518155109 has 2 divisors, whose sum is σ = 11518155110. Its totient is φ = 11518155108.

The previous prime is 11518155101. The next prime is 11518155113. The reversal of 11518155109 is 90155181511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11472552100 + 45603009 = 107110^2 + 6753^2 .

It is an emirp because it is prime and its reverse (90155181511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11518155109 - 2³ = 11518155101 is a prime.

It is a super-2 number, since 2×11518155109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11518155101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5759077554 + 5759077555.

It is an arithmetic number, because the mean of its divisors is an integer number (5759077555).

Almost surely, 2^11518155109 is an apocalyptic number.

It is an amenable number.

11518155109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11518155109 is an equidigital number, since it uses as much as digits as its factorization.

11518155109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 37.

The spelling of 11518155109 in words is "eleven billion, five hundred eighteen million, one hundred fifty-five thousand, one hundred nine".