61100505560 has 32 divisors (see below), whose sum is σ = 143453363040. Its totient is φ = 23377584384.

The previous prime is 61100505547. The next prime is 61100505619. The reversal of 61100505560 is 6550500116.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33205877 + ... + 33207716.

It is an arithmetic number, because the mean of its divisors is an integer number (4482917595).

Almost surely, 2^61100505560 is an apocalyptic number.

It is an amenable number.

61100505560 is an abundant number, since it is smaller than the sum of its proper divisors (82352857480).

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

61100505560 is a wasteful number, since it uses less digits than its factorization.

61100505560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66413627 (or 66413623 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 61100505560 in words is "sixty-one billion, one hundred million, five hundred five thousand, five hundred sixty".