363809933881 has 4 divisors (see below), whose sum is σ = 367029490932. Its totient is φ = 360590376832.

The previous prime is 363809933873. The next prime is 363809933911. The reversal of 363809933881 is 188339908363.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188339908363 = 17 ⋅11078818139.

It can be written as a sum of positive squares in 2 ways, for example, as 84065203600 + 279744730281 = 289940^2 + 528909^2 .

It is a cyclic number.

It is not a de Polignac number, because 363809933881 - 2³ = 363809933873 is a prime.

It is a super-2 number, since 2×363809933881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (363809933581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1609778356 + ... + 1609778581.

It is an arithmetic number, because the mean of its divisors is an integer number (91757372733).

Almost surely, 2^363809933881 is an apocalyptic number.

It is an amenable number.

363809933881 is a deficient number, since it is larger than the sum of its proper divisors (3219557051).

363809933881 is a wasteful number, since it uses less digits than its factorization.

363809933881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219557050.

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 363809933881 in words is "three hundred sixty-three billion, eight hundred nine million, nine hundred thirty-three thousand, eight hundred eighty-one".