65721207068 has 12 divisors (see below), whose sum is σ = 125467759032. Its totient is φ = 29873275920.

The previous prime is 65721207053. The next prime is 65721207089. The reversal of 65721207068 is 86070212756.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1493663797 = 65721207068 / (6 + 5 + 7 + 2 + 1 + 2 + 0 + 7 + 0 + 6 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746831855 + ... + 746831942.

It is an arithmetic number, because the mean of its divisors is an integer number (10455646586).

Almost surely, 2^65721207068 is an apocalyptic number.

It is an amenable number.

65721207068 is a deficient number, since it is larger than the sum of its proper divisors (59746551964).

65721207068 is a wasteful number, since it uses less digits than its factorization.

65721207068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493663812 (or 1493663810 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 65721207068 in words is "sixty-five billion, seven hundred twenty-one million, two hundred seven thousand, sixty-eight".