65668675081 has 9 divisors (see below), whose sum is σ = 66304870023. Its totient is φ = 65038534200.

The previous prime is 65668675057. The next prime is 65668675099. The reversal of 65668675081 is 18057686656.

The square root of 65668675081 is 256259.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 45770751481 + 19897923600 = 213941^2 + 141060^2 .

It is not a de Polignac number, because 65668675081 - 2²⁷ = 65534457353 is a prime.

It is a super-4 number, since 4×65668675081⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65668675181) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27931056 + ... + 27933406.

Almost surely, 2^65668675081 is an apocalyptic number.

65668675081 is the 256259-th square number.

65668675081 is the 128130-th centered octagonal number.

It is an amenable number.

65668675081 is a deficient number, since it is larger than the sum of its proper divisors (636194942).

65668675081 is an frugal number, since it uses more digits than its factorization.

65668675081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4920 (or 2460 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 58.

The spelling of 65668675081 in words is "sixty-five billion, six hundred sixty-eight million, six hundred seventy-five thousand, eighty-one".