665576803 has 2 divisors, whose sum is σ = 665576804. Its totient is φ = 665576802.

The previous prime is 665576777. The next prime is 665576819. The reversal of 665576803 is 308675566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665576803 - 2²¹ = 663479651 is a prime.

It is not a weakly prime, because it can be changed into another prime (665576203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332788401 + 332788402.

It is an arithmetic number, because the mean of its divisors is an integer number (332788402).

Almost surely, 2^665576803 is an apocalyptic number.

665576803 is a deficient number, since it is larger than the sum of its proper divisors (1).

665576803 is an equidigital number, since it uses as much as digits as its factorization.

665576803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 665576803 is about 25798.7752228667. The cubic root of 665576803 is about 873.1041632859.

The spelling of 665576803 in words is "six hundred sixty-five million, five hundred seventy-six thousand, eight hundred three".