61621751110780 has 192 divisors, whose sum is σ = 154229885042688. Its totient is φ = 20246357514240.

The previous prime is 61621751110741. The next prime is 61621751110877. The reversal of 61621751110780 is 8701115712616.

It is a self number, because there is not a number n which added to its sum of digits gives 61621751110780.

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, 55238725 + ... + 56343235.

It is an arithmetic number, because the mean of its divisors is an integer number (803280651264).

Almost surely, 2^{61621751110780} 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 61621751110780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77114942521344).

61621751110780 is an abundant number, since it is smaller than the sum of its proper divisors (92608133931908).

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

61621751110780 is a wasteful number, since it uses less digits than its factorization.

61621751110780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104756 (or 1104754 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 46.

The spelling of 61621751110780 in words is "sixty-one trillion, six hundred twenty-one billion, seven hundred fifty-one million, one hundred ten thousand, seven hundred eighty".