53865318891 has 4 divisors (see below), whose sum is σ = 71820425192. Its totient is φ = 35910212592.

The previous prime is 53865318887. The next prime is 53865318929. The reversal of 53865318891 is 19881356835.

It is a happy number.

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

It is not a de Polignac number, because 53865318891 - 2² = 53865318887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53865318821) 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, 8977553146 + ... + 8977553151.

It is an arithmetic number, because the mean of its divisors is an integer number (17955106298).

Almost surely, 2^53865318891 is an apocalyptic number.

53865318891 is a deficient number, since it is larger than the sum of its proper divisors (17955106301).

53865318891 is a wasteful number, since it uses less digits than its factorization.

53865318891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17955106300.

The product of its digits is 6220800, while the sum is 57.

The spelling of 53865318891 in words is "fifty-three billion, eight hundred sixty-five million, three hundred eighteen thousand, eight hundred ninety-one".