91656446666 has 8 divisors (see below), whose sum is σ = 138307932000. Its totient is φ = 45553802668.

The previous prime is 91656446659. The next prime is 91656446669. The reversal of 91656446666 is 66664465619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91656446669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137209916 + ... + 137210583.

It is an arithmetic number, because the mean of its divisors is an integer number (17288491500).

Almost surely, 2^91656446666 is an apocalyptic number.

91656446666 is a deficient number, since it is larger than the sum of its proper divisors (46651485334).

91656446666 is a wasteful number, since it uses less digits than its factorization.

91656446666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274420668.

The product of its digits is 33592320, while the sum is 59.

The spelling of 91656446666 in words is "ninety-one billion, six hundred fifty-six million, four hundred forty-six thousand, six hundred sixty-six".