66170427565 has 16 divisors (see below), whose sum is σ = 87389689536. Its totient is φ = 47698067200.

The previous prime is 66170427559. The next prime is 66170427593. The reversal of 66170427565 is 56572407166.

It is not a de Polignac number, because 66170427565 - 2⁹ = 66170427053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5317231 + ... + 5329660.

It is an arithmetic number, because the mean of its divisors is an integer number (5461855596).

Almost surely, 2^66170427565 is an apocalyptic number.

It is an amenable number.

66170427565 is a deficient number, since it is larger than the sum of its proper divisors (21219261971).

66170427565 is a wasteful number, since it uses less digits than its factorization.

66170427565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10647020.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 66170427565 in words is "sixty-six billion, one hundred seventy million, four hundred twenty-seven thousand, five hundred sixty-five".