61666072116 has 24 divisors (see below), whose sum is σ = 156968183904. Its totient is φ = 18686688480.

The previous prime is 61666072109. The next prime is 61666072147. The reversal of 61666072116 is 61127066616.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 233583475 + ... + 233583738.

It is an arithmetic number, because the mean of its divisors is an integer number (6540340996).

Almost surely, 2^61666072116 is an apocalyptic number.

61666072116 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61666072116 is an abundant number, since it is smaller than the sum of its proper divisors (95302111788).

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

61666072116 is a wasteful number, since it uses less digits than its factorization.

61666072116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467167231 (or 467167229 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 61666072116 in words is "sixty-one billion, six hundred sixty-six million, seventy-two thousand, one hundred sixteen".