6446857525 has 12 divisors (see below), whose sum is σ = 8029958272. Its totient is φ = 5134353840.

The previous prime is 6446857523. The next prime is 6446857537. The reversal of 6446857525 is 5257586446.

It is not a de Polignac number, because 6446857525 - 2¹ = 6446857523 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 (6446857523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572619 + ... + 583768.

Almost surely, 2^6446857525 is an apocalyptic number.

It is an amenable number.

6446857525 is a deficient number, since it is larger than the sum of its proper divisors (1583100747).

6446857525 is a wasteful number, since it uses less digits than its factorization.

6446857525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156620 (or 1156615 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 52.

The square root of 6446857525 is about 80292.3254427221. The cubic root of 6446857525 is about 1861.1556318121.

The spelling of 6446857525 in words is "six billion, four hundred forty-six million, eight hundred fifty-seven thousand, five hundred twenty-five".