61110510561 has 8 divisors (see below), whose sum is σ = 90534089760. Its totient is φ = 40740340356.

The previous prime is 61110510551. The next prime is 61110510599. The reversal of 61110510561 is 16501501116.

It is not a de Polignac number, because 61110510561 - 2⁹ = 61110510049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2263352243 = 61110510561 / (6 + 1 + 1 + 1 + 0 + 5 + 1 + 0 + 5 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (61110510551) 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 7 ways as a sum of consecutive naturals, for example, 1131676095 + ... + 1131676148.

It is an arithmetic number, because the mean of its divisors is an integer number (11316761220).

Almost surely, 2^61110510561 is an apocalyptic number.

It is an amenable number.

61110510561 is a deficient number, since it is larger than the sum of its proper divisors (29423579199).

61110510561 is a wasteful number, since it uses less digits than its factorization.

61110510561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263352252 (or 2263352246 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The spelling of 61110510561 in words is "sixty-one billion, one hundred ten million, five hundred ten thousand, five hundred sixty-one".