91866603033 has 40 divisors (see below), whose sum is σ = 139080381440. Its totient is φ = 60425235360.

The previous prime is 91866602987. The next prime is 91866603077. The reversal of 91866603033 is 33030666819.

It is not a de Polignac number, because 91866603033 - 2¹⁸ = 91866340889 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 91866603033.

It is not an unprimeable number, because it can be changed into a prime (91866603083) 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 39 ways as a sum of consecutive naturals, for example, 1837278 + ... + 1886616.

It is an arithmetic number, because the mean of its divisors is an integer number (3477009536).

Almost surely, 2^91866603033 is an apocalyptic number.

It is an amenable number.

91866603033 is a deficient number, since it is larger than the sum of its proper divisors (47213778407).

91866603033 is a wasteful number, since it uses less digits than its factorization.

91866603033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49659 (or 49650 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 91866603033 in words is "ninety-one billion, eight hundred sixty-six million, six hundred three thousand, thirty-three".