6685000521 has 4 divisors (see below), whose sum is σ = 8913334032. Its totient is φ = 4456667012.

The previous prime is 6685000501. The next prime is 6685000571. The reversal of 6685000521 is 1250005866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6685000521 - 2⁹ = 6685000009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6685000501) 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, 1114166751 + ... + 1114166756.

It is an arithmetic number, because the mean of its divisors is an integer number (2228333508).

Almost surely, 2^6685000521 is an apocalyptic number.

It is an amenable number.

6685000521 is a deficient number, since it is larger than the sum of its proper divisors (2228333511).

6685000521 is a wasteful number, since it uses less digits than its factorization.

6685000521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228333510.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 6685000521 is about 81761.8524802368. The cubic root of 6685000521 is about 1883.7957603683.

The spelling of 6685000521 in words is "six billion, six hundred eighty-five million, five hundred twenty-one", and thus it is an aban number.