669081601 has 4 divisors (see below), whose sum is σ = 669282304. Its totient is φ = 668880900.

The previous prime is 669081577. The next prime is 669081607. The reversal of 669081601 is 106180966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669081601 - 2⁹ = 669081089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669081607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95265 + ... + 102046.

It is an arithmetic number, because the mean of its divisors is an integer number (167320576).

Almost surely, 2^669081601 is an apocalyptic number.

It is an amenable number.

669081601 is a deficient number, since it is larger than the sum of its proper divisors (200703).

669081601 is a wasteful number, since it uses less digits than its factorization.

669081601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200702.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 669081601 is about 25866.6117031203. The cubic root of 669081601 is about 874.6340133617.

The spelling of 669081601 in words is "six hundred sixty-nine million, eighty-one thousand, six hundred one".