65865801838 has 4 divisors (see below), whose sum is σ = 98798702760. Its totient is φ = 32932900918.

The previous prime is 65865801797. The next prime is 65865801839. The reversal of 65865801838 is 83810856856.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65865801839) 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 as a sum of consecutive naturals, namely, 16466450458 + ... + 16466450461.

It is an arithmetic number, because the mean of its divisors is an integer number (24699675690).

Almost surely, 2^65865801838 is an apocalyptic number.

65865801838 is a deficient number, since it is larger than the sum of its proper divisors (32932900922).

65865801838 is a wasteful number, since it uses less digits than its factorization.

65865801838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32932900921.

The product of its (nonzero) digits is 11059200, while the sum is 58.

The spelling of 65865801838 in words is "sixty-five billion, eight hundred sixty-five million, eight hundred one thousand, eight hundred thirty-eight".