665576805 has 16 divisors (see below), whose sum is σ = 1066042944. Its totient is φ = 354600960.

The previous prime is 665576803. The next prime is 665576819. The reversal of 665576805 is 508675566.

It is not a de Polignac number, because 665576805 - 2¹ = 665576803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665576803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8284 + ... + 37413.

It is an arithmetic number, because the mean of its divisors is an integer number (66627684).

Almost surely, 2^665576805 is an apocalyptic number.

It is an amenable number.

665576805 is a deficient number, since it is larger than the sum of its proper divisors (400466139).

665576805 is a wasteful number, since it uses less digits than its factorization.

665576805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46676.

The product of its (nonzero) digits is 1512000, while the sum is 48.

The square root of 665576805 is about 25798.7752616282. The cubic root of 665576805 is about 873.1041641604.

The spelling of 665576805 in words is "six hundred sixty-five million, five hundred seventy-six thousand, eight hundred five".