61011111100 has 72 divisors (see below), whose sum is σ = 133745221008. Its totient is φ = 24155788800.

The previous prime is 61011111053. The next prime is 61011111101. The reversal of 61011111100 is 111111016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61011111101) 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 23 ways as a sum of consecutive naturals, for example, 21323670 + ... + 21326530.

It is an arithmetic number, because the mean of its divisors is an integer number (1857572514).

Almost surely, 2^61011111100 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 61011111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66872610504).

61011111100 is an abundant number, since it is smaller than the sum of its proper divisors (72734109908).

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

61011111100 is a wasteful number, since it uses less digits than its factorization.

61011111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975 (or 4968 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 61011111100 its reverse (111111016), we get a palindrome (61122222116).

The spelling of 61011111100 in words is "sixty-one billion, eleven million, one hundred eleven thousand, one hundred".