11515505993 has 2 divisors, whose sum is σ = 11515505994. Its totient is φ = 11515505992.

The previous prime is 11515505929. The next prime is 11515506083. The reversal of 11515505993 is 39950551511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10397473024 + 1118032969 = 101968^2 + 33437^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515505993 - 2⁶ = 11515505929 is a prime.

It is not a weakly prime, because it can be changed into another prime (11515505593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5757752996 + 5757752997.

It is an arithmetic number, because the mean of its divisors is an integer number (5757752997).

Almost surely, 2^11515505993 is an apocalyptic number.

It is an amenable number.

11515505993 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515505993 is an equidigital number, since it uses as much as digits as its factorization.

11515505993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151875, while the sum is 44.

The spelling of 11515505993 in words is "eleven billion, five hundred fifteen million, five hundred five thousand, nine hundred ninety-three".