61705247663720 has 256 divisors, whose sum is σ = 154391795712000. Its totient is φ = 22104859392000.

The previous prime is 61705247663711. The next prime is 61705247663743. The reversal of 61705247663720 is 2736674250716.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 173860445 + ... + 174214995.

It is an arithmetic number, because the mean of its divisors is an integer number (603092952000).

Almost surely, 2^{61705247663720} 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 61705247663720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77195897856000).

61705247663720 is an abundant number, since it is smaller than the sum of its proper divisors (92686548048280).

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

61705247663720 is a wasteful number, since it uses less digits than its factorization.

61705247663720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354784 (or 354780 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 56.

The spelling of 61705247663720 in words is "sixty-one trillion, seven hundred five billion, two hundred forty-seven million, six hundred sixty-three thousand, seven hundred twenty".