670663505 has 16 divisors (see below), whose sum is σ = 820316160. Its totient is φ = 526280832.

The previous prime is 670663493. The next prime is 670663531. The reversal of 670663505 is 505366076.

It is a cyclic number.

It is not a de Polignac number, because 670663505 - 2¹⁶ = 670597969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50582 + ... + 62448.

It is an arithmetic number, because the mean of its divisors is an integer number (51269760).

Almost surely, 2^670663505 is an apocalyptic number.

It is an amenable number.

670663505 is a deficient number, since it is larger than the sum of its proper divisors (149652655).

670663505 is a wasteful number, since it uses less digits than its factorization.

670663505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12088.

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 670663505 is about 25897.1717567768. The cubic root of 670663505 is about 875.3227674545.

The spelling of 670663505 in words is "six hundred seventy million, six hundred sixty-three thousand, five hundred five".