61216032020 has 216 divisors, whose sum is σ = 161674100952. Its totient is φ = 19336458240.

The previous prime is 61216031957. The next prime is 61216032029. The reversal of 61216032020 is 2023061216.

It can be written as a sum of positive squares in 12 ways, for example, as 3334276 + 61212697744 = 1826^2 + 247412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61216032029) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9088574 + ... + 9095306.

Almost surely, 2^61216032020 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 61216032020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80837050476).

61216032020 is an abundant number, since it is smaller than the sum of its proper divisors (100458068932).

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

61216032020 is a wasteful number, since it uses less digits than its factorization.

61216032020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6811 (or 6781 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 61216032020 its reverse (2023061216), we get a palindrome (63239093236).

The spelling of 61216032020 in words is "sixty-one billion, two hundred sixteen million, thirty-two thousand, twenty".