65729752081 has 8 divisors (see below), whose sum is σ = 75711211520. Its totient is φ = 55896166368.

The previous prime is 65729752079. The next prime is 65729752093. The reversal of 65729752081 is 18025792756.

It is a happy number.

65729752081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65729752081 - 2¹ = 65729752079 is a prime.

It is a super-2 number, since 2×65729752081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65729752031) 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, 36967476 + ... + 36969253.

It is an arithmetic number, because the mean of its divisors is an integer number (9463901440).

Almost surely, 2^65729752081 is an apocalyptic number.

It is an amenable number.

65729752081 is a deficient number, since it is larger than the sum of its proper divisors (9981459439).

65729752081 is a wasteful number, since it uses less digits than its factorization.

65729752081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73936863.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 65729752081 in words is "sixty-five billion, seven hundred twenty-nine million, seven hundred fifty-two thousand, eighty-one".