66016065056665 has 8 divisors (see below), whose sum is σ = 79228583801928. Its totient is φ = 52806648222720.

The previous prime is 66016065056593. The next prime is 66016065056671. The reversal of 66016065056665 is 56665056061066.

It can be written as a sum of positive squares in 4 ways, for example, as 47476220309401 + 18539844747264 = 6890299^2 + 4305792^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-66016065056665 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, 775431006 + ... + 775516135.

It is an arithmetic number, because the mean of its divisors is an integer number (9903572975241).

Almost surely, 2^{66016065056665} is an apocalyptic number.

It is an amenable number.

66016065056665 is a deficient number, since it is larger than the sum of its proper divisors (13212518745263).

66016065056665 is a wasteful number, since it uses less digits than its factorization.

66016065056665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550955659.

The product of its (nonzero) digits is 34992000, while the sum is 58.

The spelling of 66016065056665 in words is "sixty-six trillion, sixteen billion, sixty-five million, fifty-six thousand, six hundred sixty-five".