15643421853 has 8 divisors (see below), whose sum is σ = 20891594400. Its totient is φ = 10412098608.

The previous prime is 15643421803. The next prime is 15643421863. The reversal of 15643421853 is 35812434651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15643421853 - 2⁶ = 15643421789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15643421803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4210158 + ... + 4213871.

It is an arithmetic number, because the mean of its divisors is an integer number (2611449300).

Almost surely, 2^15643421853 is an apocalyptic number.

It is an amenable number.

15643421853 is a deficient number, since it is larger than the sum of its proper divisors (5248172547).

15643421853 is an equidigital number, since it uses as much as digits as its factorization.

15643421853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8424651.

The product of its digits is 345600, while the sum is 42.

The spelling of 15643421853 in words is "fifteen billion, six hundred forty-three million, four hundred twenty-one thousand, eight hundred fifty-three".