61666466616 has 32 divisors (see below), whose sum is σ = 171295741200. Its totient is φ = 20555488800.

The previous prime is 61666466611. The next prime is 61666466623.

61666466616 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61666466611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142746235 + ... + 142746666.

Almost surely, 2^61666466616 is an apocalyptic number.

It is an amenable number.

61666466616 is an abundant number, since it is smaller than the sum of its proper divisors (109629274584).

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

61666466616 is a wasteful number, since it uses less digits than its factorization.

61666466616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285492916 (or 285492906 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 54.

The spelling of 61666466616 in words is "sixty-one billion, six hundred sixty-six million, four hundred sixty-six thousand, six hundred sixteen".