66531331065 has 16 divisors (see below), whose sum is σ = 106460020800. Its totient is φ = 35480079552.

The previous prime is 66531331063. The next prime is 66531331093. The reversal of 66531331065 is 56013313566.

It is not a de Polignac number, because 66531331065 - 2¹ = 66531331063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66531331063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34650 + ... + 366419.

It is an arithmetic number, because the mean of its divisors is an integer number (6653751300).

Almost surely, 2^66531331065 is an apocalyptic number.

It is an amenable number.

66531331065 is a deficient number, since it is larger than the sum of its proper divisors (39928689735).

66531331065 is a wasteful number, since it uses less digits than its factorization.

66531331065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412136.

The product of its (nonzero) digits is 145800, while the sum is 39.

The spelling of 66531331065 in words is "sixty-six billion, five hundred thirty-one million, three hundred thirty-one thousand, sixty-five".