505656616665 has 32 divisors (see below), whose sum is σ = 835507685376. Its totient is φ = 260945038080.

The previous prime is 505656616649. The next prime is 505656616681. The reversal of 505656616665 is 566616656505.

It is an interprime number because it is at equal distance from previous prime (505656616649) and next prime (505656616681).

It is not a de Polignac number, because 505656616665 - 2⁴ = 505656616649 is a prime.

It is a super-2 number, since 2×505656616665² (a number of 24 digits) contains 22 as substring.

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, 2416377 + ... + 2617286.

It is an arithmetic number, because the mean of its divisors is an integer number (26109615168).

Almost surely, 2^505656616665 is an apocalyptic number.

It is an amenable number.

505656616665 is a deficient number, since it is larger than the sum of its proper divisors (329851068711).

505656616665 is a wasteful number, since it uses less digits than its factorization.

505656616665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033889.

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 505656616665 in words is "five hundred five billion, six hundred fifty-six million, six hundred sixteen thousand, six hundred sixty-five".