660560077 has 2 divisors, whose sum is σ = 660560078. Its totient is φ = 660560076.

The previous prime is 660560029. The next prime is 660560081. The reversal of 660560077 is 770065066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402443721 + 258116356 = 20061^2 + 16066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660560077 is a prime.

It is equal to p_34313797 and since 660560077 and 34313797 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660560377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330280038 + 330280039.

It is an arithmetic number, because the mean of its divisors is an integer number (330280039).

Almost surely, 2^660560077 is an apocalyptic number.

It is an amenable number.

660560077 is a deficient number, since it is larger than the sum of its proper divisors (1).

660560077 is an equidigital number, since it uses as much as digits as its factorization.

660560077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 660560077 is about 25701.3633295979. The cubic root of 660560077 is about 870.9049802690.

The spelling of 660560077 in words is "six hundred sixty million, five hundred sixty thousand, seventy-seven".