91178880769 has 4 divisors (see below), whose sum is σ = 91834844080. Its totient is φ = 90522917460.

The previous prime is 91178880733. The next prime is 91178880847. The reversal of 91178880769 is 96708887119.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 91178880769 - 2⁷ = 91178880641 is a prime.

It is a super-3 number, since 3×91178880769³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 91178880769.

It is not an unprimeable number, because it can be changed into a prime (91178880719) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 327981447 + ... + 327981724.

It is an arithmetic number, because the mean of its divisors is an integer number (22958711020).

Almost surely, 2^91178880769 is an apocalyptic number.

It is an amenable number.

91178880769 is a deficient number, since it is larger than the sum of its proper divisors (655963311).

91178880769 is a wasteful number, since it uses less digits than its factorization.

91178880769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655963310.

The product of its (nonzero) digits is 12192768, while the sum is 64.

The spelling of 91178880769 in words is "ninety-one billion, one hundred seventy-eight million, eight hundred eighty thousand, seven hundred sixty-nine".