11555429840 has 20 divisors (see below), whose sum is σ = 26866374564. Its totient is φ = 4622171904.

The previous prime is 11555429827. The next prime is 11555429891. The reversal of 11555429840 is 4892455511.

It can be written as a sum of positive squares in 2 ways, for example, as 1684609936 + 9870819904 = 41044^2 + 99352^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 11555429791 and 11555429800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72221357 + ... + 72221516.

Almost surely, 2^11555429840 is an apocalyptic number.

11555429840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11555429840 is an abundant number, since it is smaller than the sum of its proper divisors (15310944724).

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

11555429840 is a wasteful number, since it uses less digits than its factorization.

11555429840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144442886 (or 144442880 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 44.

The spelling of 11555429840 in words is "eleven billion, five hundred fifty-five million, four hundred twenty-nine thousand, eight hundred forty".