61718582840 has 64 divisors (see below), whose sum is σ = 142166914560. Its totient is φ = 24101320320.

The previous prime is 61718582833. The next prime is 61718582857. The reversal of 61718582840 is 4828581716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3967157 + ... + 3982683.

It is an arithmetic number, because the mean of its divisors is an integer number (2221358040).

Almost surely, 2^61718582840 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 61718582840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71083457280).

61718582840 is an abundant number, since it is smaller than the sum of its proper divisors (80448331720).

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

61718582840 is a wasteful number, since it uses less digits than its factorization.

61718582840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17892 (or 17888 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 50.

The spelling of 61718582840 in words is "sixty-one billion, seven hundred eighteen million, five hundred eighty-two thousand, eight hundred forty".