991457267333 has 16 divisors (see below), whose sum is σ = 1071230125056. Its totient is φ = 912186152640.

The previous prime is 991457267327. The next prime is 991457267377. The reversal of 991457267333 is 333762754199.

It is a cyclic number.

It is not a de Polignac number, because 991457267333 - 2¹⁶ = 991457201797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991457267533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58274798 + ... + 58291808.

It is an arithmetic number, because the mean of its divisors is an integer number (66951882816).

Almost surely, 2^991457267333 is an apocalyptic number.

It is an amenable number.

991457267333 is a deficient number, since it is larger than the sum of its proper divisors (79772857723).

991457267333 is a wasteful number, since it uses less digits than its factorization.

991457267333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31484.

The product of its digits is 25719120, while the sum is 59.

The spelling of 991457267333 in words is "nine hundred ninety-one billion, four hundred fifty-seven million, two hundred sixty-seven thousand, three hundred thirty-three".