61031078500 has 96 divisors (see below), whose sum is σ = 152508754944. Its totient is φ = 20900880000.

The previous prime is 61031078491. The next prime is 61031078503. The reversal of 61031078500 is 587013016.

It is not an unprimeable number, because it can be changed into a prime (61031078503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3178930 + ... + 3198070.

It is an arithmetic number, because the mean of its divisors is an integer number (1588632864).

Almost surely, 2^61031078500 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 61031078500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76254377472).

61031078500 is an abundant number, since it is smaller than the sum of its proper divisors (91477676444).

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

61031078500 is a wasteful number, since it uses less digits than its factorization.

61031078500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20078 (or 20066 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 61031078500 in words is "sixty-one billion, thirty-one million, seventy-eight thousand, five hundred".