61061660551640 has 256 divisors, whose sum is σ = 161801608320000. Its totient is φ = 20304276572160.

The previous prime is 61061660551637. The next prime is 61061660551673. The reversal of 61061660551640 is 4615506616016.

It is a congruent number.

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, 9007469771 + ... + 9007476549.

It is an arithmetic number, because the mean of its divisors is an integer number (632037532500).

Almost surely, 2^{61061660551640} 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 61061660551640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80900804160000).

61061660551640 is an abundant number, since it is smaller than the sum of its proper divisors (100739947768360).

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

61061660551640 is a wasteful number, since it uses less digits than its factorization.

61061660551640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010 (or 12006 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 61061660551640 in words is "sixty-one trillion, sixty-one billion, six hundred sixty million, five hundred fifty-one thousand, six hundred forty".