670911613 has 4 divisors (see below), whose sum is σ = 710377020. Its totient is φ = 631446208.

The previous prime is 670911581. The next prime is 670911643. The reversal of 670911613 is 316119076.

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

It can be written as a sum of positive squares in 2 ways, for example, as 512479044 + 158432569 = 22638^2 + 12587^2 .

It is a cyclic number.

It is not a de Polignac number, because 670911613 - 2⁵ = 670911581 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 (670911643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19732678 + ... + 19732711.

It is an arithmetic number, because the mean of its divisors is an integer number (177594255).

Almost surely, 2^670911613 is an apocalyptic number.

It is an amenable number.

670911613 is a deficient number, since it is larger than the sum of its proper divisors (39465407).

670911613 is a wasteful number, since it uses less digits than its factorization.

670911613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39465406.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 670911613 is about 25901.9615666459. The cubic root of 670911613 is about 875.4306943081.

The spelling of 670911613 in words is "six hundred seventy million, nine hundred eleven thousand, six hundred thirteen".