61665688656616 has 64 divisors (see below), whose sum is σ = 129071150714880. Its totient is φ = 27377273676480.

The previous prime is 61665688656497. The next prime is 61665688656619.

61665688656616 is nontrivially palindromic in base 10.

61665688656616 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61665688656619) 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, 157320825 + ... + 157712311.

It is an arithmetic number, because the mean of its divisors is an integer number (2016736729920).

Almost surely, 2^{61665688656616} is an apocalyptic number.

It is an amenable number.

61665688656616 is an abundant number, since it is smaller than the sum of its proper divisors (67405462058264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61665688656616 is a wasteful number, since it uses less digits than its factorization.

61665688656616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433174 (or 433170 counting only the distinct ones).

The product of its digits is 2687385600, while the sum is 76.

The spelling of 61665688656616 in words is "sixty-one trillion, six hundred sixty-five billion, six hundred eighty-eight million, six hundred fifty-six thousand, six hundred sixteen".