55640243340 has 144 divisors (see below), whose sum is σ = 193809208320. Its totient is φ = 12778611840.

The previous prime is 55640243333. The next prime is 55640243363. The reversal of 55640243340 is 4334204655.

55640243340 is a `hidden beast` number, since 5 + 5 + 640 + 2 + 4 + 3 + 3 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55640243295 and 55640243304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 701884 + ... + 777123.

It is an arithmetic number, because the mean of its divisors is an integer number (1345897280).

Almost surely, 2^55640243340 is an apocalyptic number.

It is an amenable number.

55640243340 is an abundant number, since it is smaller than the sum of its proper divisors (138168964980).

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

55640243340 is a wasteful number, since it uses less digits than its factorization.

55640243340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479052 (or 1479047 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 55640243340 its reverse (4334204655), we get a palindrome (59974447995).

The spelling of 55640243340 in words is "fifty-five billion, six hundred forty million, two hundred forty-three thousand, three hundred forty".