61646064616 has 8 divisors (see below), whose sum is σ = 115586371170. Its totient is φ = 30823032304.

The previous prime is 61646064593. The next prime is 61646064619.

61646064616 is nontrivially palindromic in base 10.

61646064616 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 only one way, i.e., 43369728516 + 18276336100 = 208254^2 + 135190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (61646064619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3852879031 + ... + 3852879046.

Almost surely, 2^61646064616 is an apocalyptic number.

It is an amenable number.

61646064616 is a deficient number, since it is larger than the sum of its proper divisors (53940306554).

61646064616 is a wasteful number, since it uses less digits than its factorization.

61646064616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7705758083 (or 7705758079 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 61646064616 in words is "sixty-one billion, six hundred forty-six million, sixty-four thousand, six hundred sixteen".