66540415065 has 32 divisors (see below), whose sum is σ = 107889408000. Its totient is φ = 35013950400.

The previous prime is 66540415049. The next prime is 66540415141. The reversal of 66540415065 is 56051404566.

It is not a de Polignac number, because 66540415065 - 2⁴ = 66540415049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1700086 + ... + 1738784.

It is an arithmetic number, because the mean of its divisors is an integer number (3371544000).

Almost surely, 2^66540415065 is an apocalyptic number.

It is an amenable number.

66540415065 is a deficient number, since it is larger than the sum of its proper divisors (41348992935).

66540415065 is a wasteful number, since it uses less digits than its factorization.

66540415065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40237.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 66540415065 in words is "sixty-six billion, five hundred forty million, four hundred fifteen thousand, sixty-five".