664970855 has 4 divisors (see below), whose sum is σ = 797965032. Its totient is φ = 531976680.

The previous prime is 664970837. The next prime is 664970869. The reversal of 664970855 is 558079466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 664970855 - 2¹⁰ = 664969831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66497081 + ... + 66497090.

It is an arithmetic number, because the mean of its divisors is an integer number (199491258).

Almost surely, 2^664970855 is an apocalyptic number.

664970855 is a deficient number, since it is larger than the sum of its proper divisors (132994177).

664970855 is a wasteful number, since it uses less digits than its factorization.

664970855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132994176.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 664970855 is about 25787.0288129517. The cubic root of 664970855 is about 872.8391218196.

The spelling of 664970855 in words is "six hundred sixty-four million, nine hundred seventy thousand, eight hundred fifty-five".