66101516065 has 8 divisors (see below), whose sum is σ = 85423497768. Its totient is φ = 48813427200.

The previous prime is 66101516053. The next prime is 66101516081. The reversal of 66101516065 is 56061510166.

It can be written as a sum of positive squares in 4 ways, for example, as 1096404544 + 65005111521 = 33112^2 + 254961^2 .

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

It is not a de Polignac number, because 66101516065 - 2⁹ = 66101515553 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, 508473136 + ... + 508473265.

It is an arithmetic number, because the mean of its divisors is an integer number (10677937221).

Almost surely, 2^66101516065 is an apocalyptic number.

66101516065 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66101516065 is a deficient number, since it is larger than the sum of its proper divisors (19321981703).

66101516065 is a wasteful number, since it uses less digits than its factorization.

66101516065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016946419.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 66101516065 in words is "sixty-six billion, one hundred one million, five hundred sixteen thousand, sixty-five".