65720006663697 has 6 divisors (see below), whose sum is σ = 94928898514242. Its totient is φ = 43813337775792.

The previous prime is 65720006663671. The next prime is 65720006663723. The reversal of 65720006663697 is 79636660002756.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65720006663671) and next prime (65720006663723).

It can be written as a sum of positive squares in only one way, i.e., 51190461872001 + 14529544791696 = 7154751^2 + 3811764^2 .

It is not a de Polignac number, because 65720006663697 - 2⁷ = 65720006663569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65720006663627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3651111481308 + ... + 3651111481325.

It is an arithmetic number, because the mean of its divisors is an integer number (15821483085707).

Almost surely, 2^{65720006663697} is an apocalyptic number.

It is an amenable number.

65720006663697 is a deficient number, since it is larger than the sum of its proper divisors (29208891850545).

65720006663697 is a wasteful number, since it uses less digits than its factorization.

65720006663697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7302222962639 (or 7302222962636 counting only the distinct ones).

The product of its (nonzero) digits is 102876480, while the sum is 63.

The spelling of 65720006663697 in words is "sixty-five trillion, seven hundred twenty billion, six million, six hundred sixty-three thousand, six hundred ninety-seven".