11387443857 has 16 divisors (see below), whose sum is σ = 15490970880. Its totient is φ = 7438612752.

The previous prime is 11387443811. The next prime is 11387443867. The reversal of 11387443857 is 75834478311.

It is not a de Polignac number, because 11387443857 - 2⁷ = 11387443729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11387443867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50443 + ... + 159120.

It is an arithmetic number, because the mean of its divisors is an integer number (968185680).

Almost surely, 2^11387443857 is an apocalyptic number.

It is an amenable number.

11387443857 is a deficient number, since it is larger than the sum of its proper divisors (4103527023).

11387443857 is a wasteful number, since it uses less digits than its factorization.

11387443857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209932.

The product of its digits is 2257920, while the sum is 51.

The spelling of 11387443857 in words is "eleven billion, three hundred eighty-seven million, four hundred forty-three thousand, eight hundred fifty-seven".