65815807873 has 4 divisors (see below), whose sum is σ = 66030191920. Its totient is φ = 65601423828.

The previous prime is 65815807867. The next prime is 65815807877. The reversal of 65815807873 is 37870851856.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65815807873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65815807877) 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 3 ways as a sum of consecutive naturals, for example, 107191563 + ... + 107192176.

It is an arithmetic number, because the mean of its divisors is an integer number (16507547980).

Almost surely, 2^65815807873 is an apocalyptic number.

It is an amenable number.

65815807873 is a deficient number, since it is larger than the sum of its proper divisors (214384047).

65815807873 is a wasteful number, since it uses less digits than its factorization.

65815807873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214384046.

The product of its (nonzero) digits is 11289600, while the sum is 58.

The spelling of 65815807873 in words is "sixty-five billion, eight hundred fifteen million, eight hundred seven thousand, eight hundred seventy-three".