61310210220 has 216 divisors, whose sum is σ = 223798302000. Its totient is φ = 13530472704.

The previous prime is 61310210197. The next prime is 61310210257. The reversal of 61310210220 is 2201201316.

61310210220 is a `hidden beast` number, since 613 + 10 + 21 + 0 + 2 + 20 = 666.

61310210220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 61310210193 and 61310210202.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 135931 + ... + 375629.

It is an arithmetic number, because the mean of its divisors is an integer number (1036103250).

Almost surely, 2^61310210220 is an apocalyptic number.

61310210220 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 61310210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111899151000).

61310210220 is an abundant number, since it is smaller than the sum of its proper divisors (162488091780).

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

61310210220 is a wasteful number, since it uses less digits than its factorization.

61310210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239757 (or 239745 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 61310210220 its reverse (2201201316), we get a palindrome (63511411536).

The spelling of 61310210220 in words is "sixty-one billion, three hundred ten million, two hundred ten thousand, two hundred twenty".