55415223440 has 40 divisors (see below), whose sum is σ = 130288056120. Its totient is φ = 21917029376.

The previous prime is 55415223427. The next prime is 55415223469. The reversal of 55415223440 is 4432251455.

It can be written as a sum of positive squares in 4 ways, for example, as 4613669776 + 50801553664 = 67924^2 + 225392^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 55415223440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3884399 + ... + 3898638.

It is an arithmetic number, because the mean of its divisors is an integer number (3257201403).

Almost surely, 2^55415223440 is an apocalyptic number.

It is an amenable number.

55415223440 is an abundant number, since it is smaller than the sum of its proper divisors (74872832680).

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

55415223440 is a wasteful number, since it uses less digits than its factorization.

55415223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7783139 (or 7783133 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 55415223440 its reverse (4432251455), we get a palindrome (59847474895).

The spelling of 55415223440 in words is "fifty-five billion, four hundred fifteen million, two hundred twenty-three thousand, four hundred forty".