616620161 has 6 divisors (see below), whose sum is σ = 625432386. Its totient is φ = 607930400.

The previous prime is 616620131. The next prime is 616620181. The reversal of 616620161 is 161026616.

It can be written as a sum of positive squares in only one way, i.e., 487570561 + 129049600 = 22081^2 + 11360^2 .

It is not a de Polignac number, because 616620161 - 2¹⁰ = 616619137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616620131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56120 + ... + 66201.

It is an arithmetic number, because the mean of its divisors is an integer number (104238731).

Almost surely, 2^616620161 is an apocalyptic number.

It is an amenable number.

616620161 is a deficient number, since it is larger than the sum of its proper divisors (8812225).

616620161 is an equidigital number, since it uses as much as digits as its factorization.

616620161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122463 (or 122392 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 616620161 is about 24831.8376484706. The cubic root of 616620161 is about 851.1496144712.

Adding to 616620161 its reverse (161026616), we get a palindrome (777646777).

The spelling of 616620161 in words is "six hundred sixteen million, six hundred twenty thousand, one hundred sixty-one".