61216031982 has 64 divisors (see below), whose sum is σ = 141779957760. Its totient is φ = 17258608224.

The previous prime is 61216031957. The next prime is 61216032029. The reversal of 61216031982 is 28913061216.

It is a self number, because there is not a number n which added to its sum of digits gives 61216031982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2984253 + ... + 3004695.

It is an arithmetic number, because the mean of its divisors is an integer number (2215311840).

Almost surely, 2^61216031982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61216031982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70889978880).

61216031982 is an abundant number, since it is smaller than the sum of its proper divisors (80563925778).

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

61216031982 is a wasteful number, since it uses less digits than its factorization.

61216031982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21397.

The product of its (nonzero) digits is 31104, while the sum is 39.

The spelling of 61216031982 in words is "sixty-one billion, two hundred sixteen million, thirty-one thousand, nine hundred eighty-two".