66510161565 has 64 divisors (see below), whose sum is σ = 118674948096. Its totient is φ = 31635203072.

The previous prime is 66510161533. The next prime is 66510161609. The reversal of 66510161565 is 56516101566.

It is a cyclic number.

It is not a de Polignac number, because 66510161565 - 2⁵ = 66510161533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 574564 + ... + 680546.

It is an arithmetic number, because the mean of its divisors is an integer number (1854296064).

Almost surely, 2^66510161565 is an apocalyptic number.

It is an amenable number.

66510161565 is a deficient number, since it is larger than the sum of its proper divisors (52164786531).

66510161565 is a wasteful number, since it uses less digits than its factorization.

66510161565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106138.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 66510161565 in words is "sixty-six billion, five hundred ten million, one hundred sixty-one thousand, five hundred sixty-five".