505165611665 has 64 divisors (see below), whose sum is σ = 725888604672. Its totient is φ = 332651827200.

The previous prime is 505165611593. The next prime is 505165611719. The reversal of 505165611665 is 566116561505.

It is not a de Polignac number, because 505165611665 - 2¹⁰ = 505165610641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9975449 + ... + 10025961.

It is an arithmetic number, because the mean of its divisors is an integer number (11342009448).

Almost surely, 2^505165611665 is an apocalyptic number.

505165611665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

505165611665 is a deficient number, since it is larger than the sum of its proper divisors (220722993007).

505165611665 is a wasteful number, since it uses less digits than its factorization.

505165611665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50810.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 505165611665 in words is "five hundred five billion, one hundred sixty-five million, six hundred eleven thousand, six hundred sixty-five".