61506306220 has 24 divisors (see below), whose sum is σ = 130932605664. Its totient is φ = 24265501056.

The previous prime is 61506306151. The next prime is 61506306259. The reversal of 61506306220 is 2260360516.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21062344 + ... + 21065263.

It is an arithmetic number, because the mean of its divisors is an integer number (5455525236).

Almost surely, 2^61506306220 is an apocalyptic number.

It is an amenable number.

61506306220 is an abundant number, since it is smaller than the sum of its proper divisors (69426299444).

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

61506306220 is a wasteful number, since it uses less digits than its factorization.

61506306220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42127689 (or 42127687 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 61506306220 its reverse (2260360516), we get a palindrome (63766666736).

The spelling of 61506306220 in words is "sixty-one billion, five hundred six million, three hundred six thousand, two hundred twenty".