61707247776 has 72 divisors (see below), whose sum is σ = 175766752980. Its totient is φ = 20535469056.

The previous prime is 61707247769. The next prime is 61707247781. The reversal of 61707247776 is 67774270716.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41503468176 + 20203779600 = 203724^2 + 142140^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1780 + ... + 351308.

Almost surely, 2^61707247776 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 61707247776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87883376490).

61707247776 is an abundant number, since it is smaller than the sum of its proper divisors (114059505204).

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

61707247776 is a wasteful number, since it uses less digits than its factorization.

61707247776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350158 (or 350147 counting only the distinct ones).

The product of its (nonzero) digits is 4840416, while the sum is 54.

The spelling of 61707247776 in words is "sixty-one billion, seven hundred seven million, two hundred forty-seven thousand, seven hundred seventy-six".