11643175081 has 2 divisors, whose sum is σ = 11643175082. Its totient is φ = 11643175080.

The previous prime is 11643175079. The next prime is 11643175127. The reversal of 11643175081 is 18057134611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11603598400 + 39576681 = 107720^2 + 6291^2 .

It is a cyclic number.

It is not a de Polignac number, because 11643175081 - 2¹ = 11643175079 is a prime.

It is a super-2 number, since 2×11643175081² (a number of 21 digits) contains 22 as substring.

Together with 11643175079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 11643175081.

It is not a weakly prime, because it can be changed into another prime (11643178081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5821587540 + 5821587541.

It is an arithmetic number, because the mean of its divisors is an integer number (5821587541).

Almost surely, 2^11643175081 is an apocalyptic number.

It is an amenable number.

11643175081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11643175081 is an equidigital number, since it uses as much as digits as its factorization.

11643175081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 11643175081 in words is "eleven billion, six hundred forty-three million, one hundred seventy-five thousand, eighty-one".