91668240660 has 24 divisors (see below), whose sum is σ = 256671074016. Its totient is φ = 24444864160.

The previous prime is 91668240619. The next prime is 91668240679. The reversal of 91668240660 is 6604286619.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 763901946 + ... + 763902065.

It is an arithmetic number, because the mean of its divisors is an integer number (10694628084).

Almost surely, 2^91668240660 is an apocalyptic number.

It is an amenable number.

91668240660 is an abundant number, since it is smaller than the sum of its proper divisors (165002833356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91668240660 is a wasteful number, since it uses less digits than its factorization.

91668240660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527804023 (or 1527804021 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The spelling of 91668240660 in words is "ninety-one billion, six hundred sixty-eight million, two hundred forty thousand, six hundred sixty".