6985520357 has 4 divisors (see below), whose sum is σ = 6985851180. Its totient is φ = 6985189536.

The previous prime is 6985520329. The next prime is 6985520369. The reversal of 6985520357 is 7530255896.

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 2970904036 + 4014616321 = 54506^2 + 63361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6985520357 is a prime.

It is a super-2 number, since 2×6985520357² = 97594989316122814898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6985520327) 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, 131408 + ... + 176745.

It is an arithmetic number, because the mean of its divisors is an integer number (1746462795).

Almost surely, 2^6985520357 is an apocalyptic number.

It is an amenable number.

6985520357 is a deficient number, since it is larger than the sum of its proper divisors (330823).

6985520357 is a wasteful number, since it uses less digits than its factorization.

6985520357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330822.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The square root of 6985520357 is about 83579.4254407148. The cubic root of 6985520357 is about 1911.6112932041.

The spelling of 6985520357 in words is "six billion, nine hundred eighty-five million, five hundred twenty thousand, three hundred fifty-seven".