91668989289 has 4 divisors (see below), whose sum is σ = 122225319056. Its totient is φ = 61112659524.

The previous prime is 91668989219. The next prime is 91668989303. The reversal of 91668989289 is 98298986619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91668989289 - 2¹³ = 91668981097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91668989289.

It is not an unprimeable number, because it can be changed into a prime (91668989219) 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, 15278164879 + ... + 15278164884.

It is an arithmetic number, because the mean of its divisors is an integer number (30556329764).

Almost surely, 2^91668989289 is an apocalyptic number.

It is an amenable number.

91668989289 is a deficient number, since it is larger than the sum of its proper divisors (30556329767).

91668989289 is a wasteful number, since it uses less digits than its factorization.

91668989289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30556329766.

The product of its digits is 241864704, while the sum is 75.

The spelling of 91668989289 in words is "ninety-one billion, six hundred sixty-eight million, nine hundred eighty-nine thousand, two hundred eighty-nine".