993321157865473 has 4 divisors (see below), whose sum is σ = 993321398313220. Its totient is φ = 993320917417728.

The previous prime is 993321157865441. The next prime is 993321157865497. The reversal of 993321157865473 is 374568751123399.

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

It can be written as a sum of positive squares in 2 ways, for example, as 170515855981584 + 822805301883889 = 13058172^2 + 28684583^2 .

It is a cyclic number.

It is not a de Polignac number, because 993321157865473 - 2⁵ = 993321157865441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 993321157865396 and 993321157865405.

It is not an unprimeable number, because it can be changed into a prime (993321157863473) 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, 113916888 + ... + 122326201.

It is an arithmetic number, because the mean of its divisors is an integer number (248330349578305).

Almost surely, 2^{993321157865473} is an apocalyptic number.

It is an amenable number.

993321157865473 is a deficient number, since it is larger than the sum of its proper divisors (240447747).

993321157865473 is a wasteful number, since it uses less digits than its factorization.

993321157865473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240447746.

The product of its digits is 1028764800, while the sum is 73.

The spelling of 993321157865473 in words is "nine hundred ninety-three trillion, three hundred twenty-one billion, one hundred fifty-seven million, eight hundred sixty-five thousand, four hundred seventy-three".