61668630289 has 16 divisors (see below), whose sum is σ = 71098739712. Its totient is φ = 52395637248.

The previous prime is 61668630271. The next prime is 61668630301. The reversal of 61668630289 is 98203686616.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61668630289 - 2⁹ = 61668629777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61668630229) 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, 278937 + ... + 448489.

It is an arithmetic number, because the mean of its divisors is an integer number (4443671232).

Almost surely, 2^61668630289 is an apocalyptic number.

It is an amenable number.

61668630289 is a deficient number, since it is larger than the sum of its proper divisors (9430109423).

61668630289 is a wasteful number, since it uses less digits than its factorization.

61668630289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170016.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 61668630289 in words is "sixty-one billion, six hundred sixty-eight million, six hundred thirty thousand, two hundred eighty-nine".