616166661616 has 80 divisors (see below), whose sum is σ = 1318542009696. Its totient is φ = 276608000000.

The previous prime is 616166661611. The next prime is 616166661641.

616166661616 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×616166661616² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616166661611) 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, 7084956 + ... + 7171396.

Almost surely, 2^616166661616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 616166661616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659271004848).

616166661616 is an abundant number, since it is smaller than the sum of its proper divisors (702375348080).

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

616166661616 is a wasteful number, since it uses less digits than its factorization.

616166661616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86962 (or 86956 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The spelling of 616166661616 in words is "six hundred sixteen billion, one hundred sixty-six million, six hundred sixty-one thousand, six hundred sixteen".