61605813335866 has 16 divisors (see below), whose sum is σ = 97844673992256. Its totient is φ = 28990927446976.

The previous prime is 61605813335851. The next prime is 61605813335873. The reversal of 61605813335866 is 66853331850616.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38770185 + ... + 40327891.

It is an arithmetic number, because the mean of its divisors is an integer number (6115292124516).

Almost surely, 2^{61605813335866} is an apocalyptic number.

61605813335866 is a deficient number, since it is larger than the sum of its proper divisors (36238860656390).

61605813335866 is a wasteful number, since it uses less digits than its factorization.

61605813335866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720933.

The product of its (nonzero) digits is 55987200, while the sum is 61.

The spelling of 61605813335866 in words is "sixty-one trillion, six hundred five billion, eight hundred thirteen million, three hundred thirty-five thousand, eight hundred sixty-six".