617007661 has 2 divisors, whose sum is σ = 617007662. Its totient is φ = 617007660.

The previous prime is 617007613. The next prime is 617007709. The reversal of 617007661 is 166700716.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (617007613) and next prime (617007709).

It can be written as a sum of positive squares in only one way, i.e., 492573636 + 124434025 = 22194^2 + 11155^2 .

It is a cyclic number.

It is not a de Polignac number, because 617007661 - 2²⁷ = 482789933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617007961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308503830 + 308503831.

It is an arithmetic number, because the mean of its divisors is an integer number (308503831).

Almost surely, 2^617007661 is an apocalyptic number.

It is an amenable number.

617007661 is a deficient number, since it is larger than the sum of its proper divisors (1).

617007661 is an equidigital number, since it uses as much as digits as its factorization.

617007661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 617007661 is about 24839.6389063931. The cubic root of 617007661 is about 851.3278719201.

The spelling of 617007661 in words is "six hundred seventeen million, seven thousand, six hundred sixty-one".