55685803440 has 160 divisors (see below), whose sum is σ = 187573708800. Its totient is φ = 13614151680.

The previous prime is 55685803423. The next prime is 55685803469. The reversal of 55685803440 is 4430858655.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 55685803440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55605 + ... + 338324.

It is an arithmetic number, because the mean of its divisors is an integer number (1172335680).

Almost surely, 2^55685803440 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 55685803440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93786854400).

55685803440 is an abundant number, since it is smaller than the sum of its proper divisors (131887905360).

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

55685803440 is a wasteful number, since it uses less digits than its factorization.

55685803440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393995 (or 393989 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 48.

The spelling of 55685803440 in words is "fifty-five billion, six hundred eighty-five million, eight hundred three thousand, four hundred forty".