65812821856 has 24 divisors (see below), whose sum is σ = 129719185344. Its totient is φ = 32868266880.

The previous prime is 65812821847. The next prime is 65812821881.

65812821856 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163955 + ... + 1219186.

It is an arithmetic number, because the mean of its divisors is an integer number (5404966056).

Almost surely, 2^65812821856 is an apocalyptic number.

It is an amenable number.

65812821856 is a deficient number, since it is larger than the sum of its proper divisors (63906363488).

65812821856 is a wasteful number, since it uses less digits than its factorization.

65812821856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384014 (or 2384006 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 52.

The spelling of 65812821856 in words is "sixty-five billion, eight hundred twelve million, eight hundred twenty-one thousand, eight hundred fifty-six".