55218874620 has 768 divisors, whose sum is σ = 205850050560. Its totient is φ = 10749542400.

The previous prime is 55218874609. The next prime is 55218874673. The reversal of 55218874620 is 2647881255.

It is a super-2 number, since 2×55218874620² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55218874620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 506595126 + ... + 506595234.

It is an arithmetic number, because the mean of its divisors is an integer number (268033920).

Almost surely, 2^55218874620 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 55218874620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102925025280).

55218874620 is an abundant number, since it is smaller than the sum of its proper divisors (150631175940).

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

55218874620 is a wasteful number, since it uses less digits than its factorization.

55218874620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 55218874620 in words is "fifty-five billion, two hundred eighteen million, eight hundred seventy-four thousand, six hundred twenty".