61166620205 has 32 divisors (see below), whose sum is σ = 74531923200. Its totient is φ = 48186432000.

The previous prime is 61166620183. The next prime is 61166620213. The reversal of 61166620205 is 50202666116.

It is not a de Polignac number, because 61166620205 - 2⁸ = 61166619949 is a prime.

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, 48582866 + ... + 48584124.

It is an arithmetic number, because the mean of its divisors is an integer number (2329122600).

Almost surely, 2^61166620205 is an apocalyptic number.

It is an amenable number.

61166620205 is a deficient number, since it is larger than the sum of its proper divisors (13365302995).

61166620205 is a wasteful number, since it uses less digits than its factorization.

61166620205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 61166620205 in words is "sixty-one billion, one hundred sixty-six million, six hundred twenty thousand, two hundred five".