55549792440 has 128 divisors (see below), whose sum is σ = 185235552000. Its totient is φ = 14807712384.

The previous prime is 55549792421. The next prime is 55549792457. The reversal of 55549792440 is 4429794555.

It is a happy number.

55549792440 is a `hidden beast` number, since 5 + 5 + 549 + 7 + 92 + 4 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3433891 + ... + 3450029.

It is an arithmetic number, because the mean of its divisors is an integer number (1447152750).

Almost surely, 2^55549792440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55549792440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92617776000).

55549792440 is an abundant number, since it is smaller than the sum of its proper divisors (129685759560).

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

55549792440 is a wasteful number, since it uses less digits than its factorization.

55549792440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19346 (or 19336 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 54.

The spelling of 55549792440 in words is "fifty-five billion, five hundred forty-nine million, seven hundred ninety-two thousand, four hundred forty".