61608724217 has 16 divisors (see below), whose sum is σ = 65379085200. Its totient is φ = 57854791680.

The previous prime is 61608724211. The next prime is 61608724253. The reversal of 61608724217 is 71242780616.

61608724217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 17397241 + 61591326976 = 4171^2 + 248176^2 .

It is not a de Polignac number, because 61608724217 - 2⁴ = 61608724201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61608724211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19943009 + ... + 19946097.

It is an arithmetic number, because the mean of its divisors is an integer number (4086192825).

Almost surely, 2^61608724217 is an apocalyptic number.

It is an amenable number.

61608724217 is a deficient number, since it is larger than the sum of its proper divisors (3770360983).

61608724217 is a wasteful number, since it uses less digits than its factorization.

61608724217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5356.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 61608724217 in words is "sixty-one billion, six hundred eight million, seven hundred twenty-four thousand, two hundred seventeen".