11526543997 has 2 divisors, whose sum is σ = 11526543998. Its totient is φ = 11526543996.

The previous prime is 11526543991. The next prime is 11526544013. The reversal of 11526543997 is 79934562511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10360389796 + 1166154201 = 101786^2 + 34149^2 .

It is a cyclic number.

It is not a de Polignac number, because 11526543997 - 2³ = 11526543989 is a prime.

It is a super-2 number, since 2×11526543997² (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 (11526543991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5763271998 + 5763271999.

It is an arithmetic number, because the mean of its divisors is an integer number (5763271999).

Almost surely, 2^11526543997 is an apocalyptic number.

It is an amenable number.

11526543997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11526543997 is an equidigital number, since it uses as much as digits as its factorization.

11526543997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The spelling of 11526543997 in words is "eleven billion, five hundred twenty-six million, five hundred forty-three thousand, nine hundred ninety-seven".