618550220880 has 240 divisors, whose sum is σ = 2173306524480. Its totient is φ = 163486439424.

The previous prime is 618550220863. The next prime is 618550220909. The reversal of 618550220880 is 88022055816.

618550220880 is a `hidden beast` number, since 6 + 18 + 550 + 2 + 2 + 0 + 8 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2055931 + ... + 2337509.

It is an arithmetic number, because the mean of its divisors is an integer number (9055443852).

Almost surely, 2^618550220880 is an apocalyptic number.

618550220880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618550220880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086653262240).

618550220880 is an abundant number, since it is smaller than the sum of its proper divisors (1554756303600).

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

618550220880 is a wasteful number, since it uses less digits than its factorization.

618550220880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281720 (or 281702 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The spelling of 618550220880 in words is "six hundred eighteen billion, five hundred fifty million, two hundred twenty thousand, eight hundred eighty".