501616565161 has 4 divisors (see below), whose sum is σ = 501674184592. Its totient is φ = 501558945732.

The previous prime is 501616565137. The next prime is 501616565189. The reversal of 501616565161 is 161565616105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 501616565161 - 2⁹ = 501616564649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501616565101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28796655 + ... + 28814068.

It is an arithmetic number, because the mean of its divisors is an integer number (125418546148).

Almost surely, 2^501616565161 is an apocalyptic number.

It is an amenable number.

501616565161 is a deficient number, since it is larger than the sum of its proper divisors (57619431).

501616565161 is an equidigital number, since it uses as much as digits as its factorization.

501616565161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57619430.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 501616565161 in words is "five hundred one billion, six hundred sixteen million, five hundred sixty-five thousand, one hundred sixty-one".