215543651423 has 16 divisors (see below), whose sum is σ = 229457896416. Its totient is φ = 201767946240.

The previous prime is 215543651371. The next prime is 215543651431. The reversal of 215543651423 is 324156345512.

It is a de Polignac number, because none of the positive numbers 2^k-215543651423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215543651123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5551265 + ... + 5589957.

It is an arithmetic number, because the mean of its divisors is an integer number (14341118526).

Almost surely, 2^215543651423 is an apocalyptic number.

215543651423 is a deficient number, since it is larger than the sum of its proper divisors (13914244993).

215543651423 is a wasteful number, since it uses less digits than its factorization.

215543651423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40474.

The product of its digits is 432000, while the sum is 41.

Adding to 215543651423 its reverse (324156345512), we get a palindrome (539699996935).

The spelling of 215543651423 in words is "two hundred fifteen billion, five hundred forty-three million, six hundred fifty-one thousand, four hundred twenty-three".