65577661 has 2 divisors, whose sum is σ = 65577662. Its totient is φ = 65577660.

The previous prime is 65577649. The next prime is 65577689. The reversal of 65577661 is 16677556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60933636 + 4644025 = 7806^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 65577661 - 2¹⁵ = 65544893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65577691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32788830 + 32788831.

It is an arithmetic number, because the mean of its divisors is an integer number (32788831).

Almost surely, 2^65577661 is an apocalyptic number.

It is an amenable number.

65577661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65577661 is an equidigital number, since it uses as much as digits as its factorization.

65577661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 43.

The square root of 65577661 is about 8098.0035193867. The cubic root of 65577661 is about 403.2601501140.

The spelling of 65577661 in words is "sixty-five million, five hundred seventy-seven thousand, six hundred sixty-one".