11634543440 has 160 divisors (see below), whose sum is σ = 30094073856. Its totient is φ = 4155217920.

The previous prime is 11634543413. The next prime is 11634543449. The reversal of 11634543440 is 4434543611.

It is a self number, because there is not a number n which added to its sum of digits gives 11634543440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11634543449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7348889 + ... + 7350471.

Almost surely, 2^11634543440 is an apocalyptic number.

11634543440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11634543440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15047036928).

11634543440 is an abundant number, since it is smaller than the sum of its proper divisors (18459530416).

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

11634543440 is a wasteful number, since it uses less digits than its factorization.

11634543440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837 (or 1831 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 11634543440 in words is "eleven billion, six hundred thirty-four million, five hundred forty-three thousand, four hundred forty".