61739971950 has 96 divisors (see below), whose sum is σ = 160175685600. Its totient is φ = 15717560320.

The previous prime is 61739971913. The next prime is 61739971957. The reversal of 61739971950 is 5917993716.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61739971957) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 307414 + ... + 466886.

It is an arithmetic number, because the mean of its divisors is an integer number (1668496725).

Almost surely, 2^61739971950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61739971950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80087842800).

61739971950 is an abundant number, since it is smaller than the sum of its proper divisors (98435713650).

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

61739971950 is a wasteful number, since it uses less digits than its factorization.

61739971950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159606 (or 159601 counting only the distinct ones).

The product of its (nonzero) digits is 3214890, while the sum is 57.

The spelling of 61739971950 in words is "sixty-one billion, seven hundred thirty-nine million, nine hundred seventy-one thousand, nine hundred fifty".