670006521 has 24 divisors (see below), whose sum is σ = 992493216. Its totient is φ = 435314880.

The previous prime is 670006511. The next prime is 670006529. The reversal of 670006521 is 125600076.

670006521 is a `hidden beast` number, since 6 + 7 + 0 + 0 + 0 + 652 + 1 = 666.

It is not a de Polignac number, because 670006521 - 2⁵ = 670006489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (670006529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199966 + ... + 203288.

It is an arithmetic number, because the mean of its divisors is an integer number (41353884).

Almost surely, 2^670006521 is an apocalyptic number.

It is an amenable number.

670006521 is a deficient number, since it is larger than the sum of its proper divisors (322486695).

670006521 is a wasteful number, since it uses less digits than its factorization.

670006521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3893 (or 3890 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 670006521 is about 25884.4841748875. The cubic root of 670006521 is about 875.0368511282.

Adding to 670006521 its reverse (125600076), we get a palindrome (795606597).

The spelling of 670006521 in words is "six hundred seventy million, six thousand, five hundred twenty-one".