61166666616 has 128 divisors (see below), whose sum is σ = 167989248000. Its totient is φ = 18405636480.

The previous prime is 61166666599. The next prime is 61166666623. The reversal of 61166666616 is 61666666116.

It is a happy number.

It is a super-2 number, since 2×61166666616² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39033465 + ... + 39035031.

It is an arithmetic number, because the mean of its divisors is an integer number (1312416000).

Almost surely, 2^61166666616 is an apocalyptic number.

61166666616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61166666616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83994624000).

61166666616 is an abundant number, since it is smaller than the sum of its proper divisors (106822581384).

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

61166666616 is a wasteful number, since it uses less digits than its factorization.

61166666616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529 (or 2525 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 51.

The spelling of 61166666616 in words is "sixty-one billion, one hundred sixty-six million, six hundred sixty-six thousand, six hundred sixteen".