616611601 has 4 divisors (see below), whose sum is σ = 637874100. Its totient is φ = 595349104.

The previous prime is 616611571. The next prime is 616611613. The reversal of 616611601 is 106116616.

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 283585600 + 333026001 = 16840^2 + 18249^2 .

It is a cyclic number.

It is not a de Polignac number, because 616611601 - 2⁷ = 616611473 is a prime.

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 616611601.

It is not an unprimeable number, because it can be changed into a prime (616611661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10631206 + ... + 10631263.

It is an arithmetic number, because the mean of its divisors is an integer number (159468525).

Almost surely, 2^616611601 is an apocalyptic number.

It is an amenable number.

616611601 is a deficient number, since it is larger than the sum of its proper divisors (21262499).

616611601 is a wasteful number, since it uses less digits than its factorization.

616611601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21262498.

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

The square root of 616611601 is about 24831.6652884981. The cubic root of 616611601 is about 851.1456758637.

The spelling of 616611601 in words is "six hundred sixteen million, six hundred eleven thousand, six hundred one".