993266564075891 has 4 divisors (see below), whose sum is σ = 1135161787515312. Its totient is φ = 851371340636472.

The previous prime is 993266564075881. The next prime is 993266564075923. The reversal of 993266564075891 is 198570465662399.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 993266564075891 - 2³⁴ = 993249384206707 is a prime.

It is a super-2 number, since 2×993266564075891² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993266564075881) 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, 70947611719700 + ... + 70947611719713.

It is an arithmetic number, because the mean of its divisors is an integer number (283790446878828).

It is a 1-persistent number, because it is pandigital, but 2⋅993266564075891 = 1986533128151782 is not.

Almost surely, 2^{993266564075891} is an apocalyptic number.

993266564075891 is a deficient number, since it is larger than the sum of its proper divisors (141895223439421).

993266564075891 is a wasteful number, since it uses less digits than its factorization.

993266564075891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141895223439420.

The product of its (nonzero) digits is 5290790400, while the sum is 80.

The spelling of 993266564075891 in words is "nine hundred ninety-three trillion, two hundred sixty-six billion, five hundred sixty-four million, seventy-five thousand, eight hundred ninety-one".