11611556440 has 64 divisors (see below), whose sum is σ = 29740296960. Its totient is φ = 4038798720.

The previous prime is 11611556351. The next prime is 11611556443. The reversal of 11611556440 is 4465511611.

It is a junction number, because it is equal to n+sod(n) for n = 11611556396 and 11611556405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11611556443) 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, 563574 + ... + 583813.

It is an arithmetic number, because the mean of its divisors is an integer number (464692140).

Almost surely, 2^11611556440 is an apocalyptic number.

11611556440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11611556440 is an abundant number, since it is smaller than the sum of its proper divisors (18128740520).

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

11611556440 is a wasteful number, since it uses less digits than its factorization.

11611556440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147432 (or 1147428 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 11611556440 in words is "eleven billion, six hundred eleven million, five hundred fifty-six thousand, four hundred forty".