610616161 has 4 divisors (see below), whose sum is σ = 620626324. Its totient is φ = 600606000.

The previous prime is 610616159. The next prime is 610616173. The reversal of 610616161 is 161616016.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52475536 + 558140625 = 7244^2 + 23625^2 .

It is not a de Polignac number, because 610616161 - 2¹ = 610616159 is a prime.

It is a Duffinian number.

610616161 is a modest number, since divided by 616161 gives 610 as remainder.

It is not an unprimeable number, because it can be changed into a prime (610616101) 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, 5004990 + ... + 5005111.

It is an arithmetic number, because the mean of its divisors is an integer number (155156581).

Almost surely, 2^610616161 is an apocalyptic number.

610616161 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

610616161 is a deficient number, since it is larger than the sum of its proper divisors (10010163).

610616161 is a wasteful number, since it uses less digits than its factorization.

610616161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010162.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 610616161 is about 24710.6487369312. The cubic root of 610616161 is about 848.3780655385.

The spelling of 610616161 in words is "six hundred ten million, six hundred sixteen thousand, one hundred sixty-one".