66511610016065 has 8 divisors (see below), whose sum is σ = 79814714347368. Its totient is φ = 53208766460800.

The previous prime is 66511610015969. The next prime is 66511610016133. The reversal of 66511610016065 is 56061001611566.

It can be written as a sum of positive squares in 4 ways, for example, as 2192108252929 + 64319501763136 = 1480577^2 + 8019944^2 .

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

It is not a de Polignac number, because 66511610016065 - 2¹² = 66511610011969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64632452 + ... + 65653461.

It is an arithmetic number, because the mean of its divisors is an integer number (9976839293421).

Almost surely, 2^{66511610016065} is an apocalyptic number.

It is an amenable number.

66511610016065 is a deficient number, since it is larger than the sum of its proper divisors (13303104331303).

66511610016065 is a wasteful number, since it uses less digits than its factorization.

66511610016065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130388019.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 66511610016065 in words is "sixty-six trillion, five hundred eleven billion, six hundred ten million, sixteen thousand, sixty-five".