11543951857 has 2 divisors, whose sum is σ = 11543951858. Its totient is φ = 11543951856.

The previous prime is 11543951851. The next prime is 11543951869. The reversal of 11543951857 is 75815934511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11539915776 + 4036081 = 107424^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 11543951857 - 2³ = 11543951849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11543951857.

It is not a weakly prime, because it can be changed into another prime (11543951851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5771975928 + 5771975929.

It is an arithmetic number, because the mean of its divisors is an integer number (5771975929).

Almost surely, 2^11543951857 is an apocalyptic number.

It is an amenable number.

11543951857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11543951857 is an equidigital number, since it uses as much as digits as its factorization.

11543951857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756000, while the sum is 49.

The spelling of 11543951857 in words is "eleven billion, five hundred forty-three million, nine hundred fifty-one thousand, eight hundred fifty-seven".