55055602640 has 80 divisors (see below), whose sum is σ = 129227014656. Its totient is φ = 21812736000.

The previous prime is 55055602627. The next prime is 55055602649. The reversal of 55055602640 is 4620655055.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×55055602640² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55055602594 and 55055602603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55055602649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4257785 + ... + 4270695.

Almost surely, 2^55055602640 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 55055602640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64613507328).

55055602640 is an abundant number, since it is smaller than the sum of its proper divisors (74171412016).

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

55055602640 is a wasteful number, since it uses less digits than its factorization.

55055602640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13428 (or 13422 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 55055602640 in words is "fifty-five billion, fifty-five million, six hundred two thousand, six hundred forty".