61010505561 has 8 divisors (see below), whose sum is σ = 83078135424. Its totient is φ = 39808273040.

The previous prime is 61010505463. The next prime is 61010505583. The reversal of 61010505561 is 16550501016.

61010505561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61010505561 - 2¹⁰ = 61010504537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61010500561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216349170 + ... + 216349451.

It is an arithmetic number, because the mean of its divisors is an integer number (10384766928).

Almost surely, 2^61010505561 is an apocalyptic number.

It is an amenable number.

61010505561 is a deficient number, since it is larger than the sum of its proper divisors (22067629863).

61010505561 is a wasteful number, since it uses less digits than its factorization.

61010505561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432698671.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 61010505561 in words is "sixty-one billion, ten million, five hundred five thousand, five hundred sixty-one".