65815651712 has 32 divisors (see below), whose sum is σ = 131183220000. Its totient is φ = 32891235840.

The previous prime is 65815651703. The next prime is 65815651723. The reversal of 65815651712 is 21715651856.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127262 + ... + 384482.

It is an arithmetic number, because the mean of its divisors is an integer number (4099475625).

Almost surely, 2^65815651712 is an apocalyptic number.

It is an amenable number.

65815651712 is a deficient number, since it is larger than the sum of its proper divisors (65367568288).

65815651712 is a wasteful number, since it uses less digits than its factorization.

65815651712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259234 (or 259222 counting only the distinct ones).

The product of its digits is 504000, while the sum is 47.

The spelling of 65815651712 in words is "sixty-five billion, eight hundred fifteen million, six hundred fifty-one thousand, seven hundred twelve".