664069877 has 8 divisors (see below), whose sum is σ = 667527576. Its totient is φ = 660621312.

The previous prime is 664069873. The next prime is 664069891. The reversal of 664069877 is 778960466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 181872196 + 482197681 = 13486^2 + 21959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664069877 - 2² = 664069873 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664069873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178763 + ... + 182439.

It is an arithmetic number, because the mean of its divisors is an integer number (83440947).

Almost surely, 2^664069877 is an apocalyptic number.

It is an amenable number.

664069877 is a deficient number, since it is larger than the sum of its proper divisors (3457699).

664069877 is a wasteful number, since it uses less digits than its factorization.

664069877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The square root of 664069877 is about 25769.5532945373. The cubic root of 664069877 is about 872.4447364718. Note that the first 3 decimals are identical.

The spelling of 664069877 in words is "six hundred sixty-four million, sixty-nine thousand, eight hundred seventy-seven".