656219161 has 16 divisors (see below), whose sum is σ = 734000400. Its totient is φ = 582709248.

The previous prime is 656219153. The next prime is 656219167. The reversal of 656219161 is 161912656.

It can be written as a sum of positive squares in 8 ways, for example, as 86490000 + 569729161 = 9300^2 + 23869^2 .

It is a cyclic number.

It is not a de Polignac number, because 656219161 - 2³ = 656219153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 656219161.

It is not an unprimeable number, because it can be changed into a prime (656219167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35145 + ... + 50473.

It is an arithmetic number, because the mean of its divisors is an integer number (45875025).

Almost surely, 2^656219161 is an apocalyptic number.

It is an amenable number.

656219161 is a deficient number, since it is larger than the sum of its proper divisors (77781239).

656219161 is a wasteful number, since it uses less digits than its factorization.

656219161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15468.

The product of its digits is 19440, while the sum is 37.

The square root of 656219161 is about 25616.7749921804. The cubic root of 656219161 is about 868.9930486673.

The spelling of 656219161 in words is "six hundred fifty-six million, two hundred nineteen thousand, one hundred sixty-one".