66165101505 has 20 divisors (see below), whose sum is σ = 118607071572. Its totient is φ = 35288053920.

The previous prime is 66165101491. The next prime is 66165101533. The reversal of 66165101505 is 50510156166.

It can be written as a sum of positive squares in 2 ways, for example, as 36624773376 + 29540328129 = 191376^2 + 171873^2 .

It is not a de Polignac number, because 66165101505 - 2⁷ = 66165101377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66165101505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 81684906 + ... + 81685715.

Almost surely, 2^66165101505 is an apocalyptic number.

It is an amenable number.

66165101505 is a deficient number, since it is larger than the sum of its proper divisors (52441970067).

66165101505 is a wasteful number, since it uses less digits than its factorization.

66165101505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163370638 (or 163370629 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 66165101505 in words is "sixty-six billion, one hundred sixty-five million, one hundred one thousand, five hundred five".