61656566065 has 16 divisors (see below), whose sum is σ = 76552519680. Its totient is φ = 47616085440.

The previous prime is 61656566063. The next prime is 61656566077. The reversal of 61656566065 is 56066565616.

It is not a de Polignac number, because 61656566065 - 2¹ = 61656566063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61656566063) 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, 875392 + ... + 943198.

It is an arithmetic number, because the mean of its divisors is an integer number (4784532480).

Almost surely, 2^61656566065 is an apocalyptic number.

It is an amenable number.

61656566065 is a deficient number, since it is larger than the sum of its proper divisors (14895953615).

61656566065 is a wasteful number, since it uses less digits than its factorization.

61656566065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74112.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 61656566065 in words is "sixty-one billion, six hundred fifty-six million, five hundred sixty-six thousand, sixty-five".