55015208640 has 672 divisors, whose sum is σ = 233605425600. Its totient is φ = 12138577920.

The previous prime is 55015208623. The next prime is 55015208641. The reversal of 55015208640 is 4680251055.

55015208640 is a `hidden beast` number, since 5 + 5 + 0 + 1 + 5 + 2 + 0 + 8 + 640 = 666.

55015208640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (672).

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 = 55015208595 and 55015208604.

It is not an unprimeable number, because it can be changed into a prime (55015208641) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12275200 + ... + 12279680.

Almost surely, 2^55015208640 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 55015208640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116802712800).

55015208640 is an abundant number, since it is smaller than the sum of its proper divisors (178590216960).

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

55015208640 is a wasteful number, since it uses less digits than its factorization.

55015208640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4550 (or 4527 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 55015208640 its reverse (4680251055), we get a palindrome (59695459695).

The spelling of 55015208640 in words is "fifty-five billion, fifteen million, two hundred eight thousand, six hundred forty".