666624577 has 2 divisors, whose sum is σ = 666624578. Its totient is φ = 666624576.

The previous prime is 666624487. The next prime is 666624611. The reversal of 666624577 is 775426666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555026481 + 111598096 = 23559^2 + 10564^2 .

It is a cyclic number.

It is not a de Polignac number, because 666624577 - 2¹¹ = 666622529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666624577.

It is not a weakly prime, because it can be changed into another prime (666624677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333312288 + 333312289.

It is an arithmetic number, because the mean of its divisors is an integer number (333312289).

Almost surely, 2^666624577 is an apocalyptic number.

It is an amenable number.

666624577 is a deficient number, since it is larger than the sum of its proper divisors (1).

666624577 is an equidigital number, since it uses as much as digits as its factorization.

666624577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 49.

The square root of 666624577 is about 25819.0738989608. The cubic root of 666624577 is about 873.5620799941.

The spelling of 666624577 in words is "six hundred sixty-six million, six hundred twenty-four thousand, five hundred seventy-seven".