665576629 has 2 divisors, whose sum is σ = 665576630. Its totient is φ = 665576628.

The previous prime is 665576579. The next prime is 665576641. The reversal of 665576629 is 926675566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644398225 + 21178404 = 25385^2 + 4602^2 .

It is a cyclic number.

It is not a de Polignac number, because 665576629 - 2¹³ = 665568437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665576929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332788314 + 332788315.

It is an arithmetic number, because the mean of its divisors is an integer number (332788315).

Almost surely, 2^665576629 is an apocalyptic number.

It is an amenable number.

665576629 is a deficient number, since it is larger than the sum of its proper divisors (1).

665576629 is an equidigital number, since it uses as much as digits as its factorization.

665576629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 52.

The square root of 665576629 is about 25798.7718506134. The cubic root of 665576629 is about 873.1040872014.

The spelling of 665576629 in words is "six hundred sixty-five million, five hundred seventy-six thousand, six hundred twenty-nine".