23781219853 has 4 divisors (see below), whose sum is σ = 23794426108. Its totient is φ = 23768013600.

The previous prime is 23781219851. The next prime is 23781219859. The reversal of 23781219853 is 35891218732.

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 11250208489 + 12531011364 = 106067^2 + 111942^2 .

It is a cyclic number.

It is not a de Polignac number, because 23781219853 - 2¹ = 23781219851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23781219797 and 23781219806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23781219851) 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, 6600426 + ... + 6604027.

It is an arithmetic number, because the mean of its divisors is an integer number (5948606527).

Almost surely, 2^23781219853 is an apocalyptic number.

It is an amenable number.

23781219853 is a deficient number, since it is larger than the sum of its proper divisors (13206255).

23781219853 is a wasteful number, since it uses less digits than its factorization.

23781219853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13206254.

The product of its digits is 725760, while the sum is 49.

The spelling of 23781219853 in words is "twenty-three billion, seven hundred eighty-one million, two hundred nineteen thousand, eight hundred fifty-three".