11400331555 has 4 divisors (see below), whose sum is σ = 13680397872. Its totient is φ = 9120265240.

The previous prime is 11400331513. The next prime is 11400331559. The reversal of 11400331555 is 55513300411.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-11400331555 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11400331559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140033151 + ... + 1140033160.

It is an arithmetic number, because the mean of its divisors is an integer number (3420099468).

Almost surely, 2^11400331555 is an apocalyptic number.

11400331555 is a deficient number, since it is larger than the sum of its proper divisors (2280066317).

11400331555 is an equidigital number, since it uses as much as digits as its factorization.

11400331555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280066316.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 11400331555 its reverse (55513300411), we get a palindrome (66913631966).

The spelling of 11400331555 in words is "eleven billion, four hundred million, three hundred thirty-one thousand, five hundred fifty-five".