11161263440 has 40 divisors (see below), whose sum is σ = 26017763328. Its totient is φ = 4452836480.

The previous prime is 11161263431. The next prime is 11161263469. The reversal of 11161263440 is 4436216111.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151496 + ... + 212775.

Almost surely, 2^11161263440 is an apocalyptic number.

11161263440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11161263440 is an abundant number, since it is smaller than the sum of its proper divisors (14856499888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11161263440 is a wasteful number, since it uses less digits than its factorization.

11161263440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364667 (or 364661 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 11161263440 its reverse (4436216111), we get a palindrome (15597479551).

The spelling of 11161263440 in words is "eleven billion, one hundred sixty-one million, two hundred sixty-three thousand, four hundred forty".