61671661205 has 16 divisors (see below), whose sum is σ = 92267213184. Its totient is φ = 38444671680.

The previous prime is 61671661199. The next prime is 61671661217. The reversal of 61671661205 is 50216617616.

It is not a de Polignac number, because 61671661205 - 2¹⁰ = 61671660181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80092682 + ... + 80093451.

It is an arithmetic number, because the mean of its divisors is an integer number (5766700824).

Almost surely, 2^61671661205 is an apocalyptic number.

It is an amenable number.

61671661205 is a deficient number, since it is larger than the sum of its proper divisors (30595551979).

61671661205 is a wasteful number, since it uses less digits than its factorization.

61671661205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160186156.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 61671661205 in words is "sixty-one billion, six hundred seventy-one million, six hundred sixty-one thousand, two hundred five".