670512521 has 32 divisors (see below), whose sum is σ = 842400000. Its totient is φ = 531476736.

The previous prime is 670512517. The next prime is 670512523. The reversal of 670512521 is 125215076.

It is not a de Polignac number, because 670512521 - 2² = 670512517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (670512523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343055 + ... + 345003.

It is an arithmetic number, because the mean of its divisors is an integer number (26325000).

Almost surely, 2^670512521 is an apocalyptic number.

It is an amenable number.

670512521 is a deficient number, since it is larger than the sum of its proper divisors (171887479).

670512521 is a wasteful number, since it uses less digits than its factorization.

670512521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046 (or 2032 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 670512521 is about 25894.2565253378. The cubic root of 670512521 is about 875.2570764631.

Adding to 670512521 its reverse (125215076), we get a palindrome (795727597).

The spelling of 670512521 in words is "six hundred seventy million, five hundred twelve thousand, five hundred twenty-one".