65720533979566 has 16 divisors (see below), whose sum is σ = 98609652545040. Its totient is φ = 32850651052800.

The previous prime is 65720533979491. The next prime is 65720533979567. The reversal of 65720533979566 is 66597933502756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65720533979567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107110945 + ... + 107722771.

It is an arithmetic number, because the mean of its divisors is an integer number (6163103284065).

Almost surely, 2^{65720533979566} is an apocalyptic number.

65720533979566 is a deficient number, since it is larger than the sum of its proper divisors (32889118565474).

65720533979566 is a wasteful number, since it uses less digits than its factorization.

65720533979566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627459.

The product of its (nonzero) digits is 1928934000, while the sum is 73.

The spelling of 65720533979566 in words is "sixty-five trillion, seven hundred twenty billion, five hundred thirty-three million, nine hundred seventy-nine thousand, five hundred sixty-six".