61100205100 has 36 divisors (see below), whose sum is σ = 144640851768. Its totient is φ = 22218256000.

The previous prime is 61100205097. The next prime is 61100205109. The reversal of 61100205100 is 150200116.

It is a happy number.

61100205100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61100205109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27771721 + ... + 27773920.

It is an arithmetic number, because the mean of its divisors is an integer number (4017801438).

Almost surely, 2^61100205100 is an apocalyptic number.

It is an amenable number.

61100205100 is an abundant number, since it is smaller than the sum of its proper divisors (83540646668).

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

61100205100 is a wasteful number, since it uses less digits than its factorization.

61100205100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55545666 (or 55545659 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 61100205100 its reverse (150200116), we get a palindrome (61250405216).

The spelling of 61100205100 in words is "sixty-one billion, one hundred million, two hundred five thousand, one hundred".