61109560512 has 1120 divisors, whose sum is σ = 248610485760. Its totient is φ = 14509393920.

The previous prime is 61109560507. The next prime is 61109560549. The reversal of 61109560512 is 21506590116.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 593296653 + ... + 593296755.

It is an arithmetic number, because the mean of its divisors is an integer number (221973648).

Almost surely, 2^61109560512 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 61109560512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124305242880).

61109560512 is an abundant number, since it is smaller than the sum of its proper divisors (187500925248).

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

61109560512 is a wasteful number, since it uses less digits than its factorization.

61109560512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 61109560512 in words is "sixty-one billion, one hundred nine million, five hundred sixty thousand, five hundred twelve".