61616277561 has 8 divisors (see below), whose sum is σ = 82952658880. Its totient is φ = 40678707312.

The previous prime is 61616277559. The next prime is 61616277719. The reversal of 61616277561 is 16577261616.

61616277561 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 not a de Polignac number, because 61616277561 - 2¹ = 61616277559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61616277561.

It is not an unprimeable number, because it can be changed into a prime (61616277161) 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, 99702406 + ... + 99703023.

It is an arithmetic number, because the mean of its divisors is an integer number (10369082360).

Almost surely, 2^61616277561 is an apocalyptic number.

It is an amenable number.

61616277561 is a deficient number, since it is larger than the sum of its proper divisors (21336381319).

61616277561 is a wasteful number, since it uses less digits than its factorization.

61616277561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199405535.

The product of its digits is 635040, while the sum is 48.

The spelling of 61616277561 in words is "sixty-one billion, six hundred sixteen million, two hundred seventy-seven thousand, five hundred sixty-one".