6539666025 has 48 divisors (see below), whose sum is σ = 11396324160. Its totient is φ = 3303955200.

The previous prime is 6539665997. The next prime is 6539666041. The reversal of 6539666025 is 5206669356.

It is not a de Polignac number, because 6539666025 - 2⁹ = 6539665513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86910 + ... + 143640.

It is an arithmetic number, because the mean of its divisors is an integer number (237423420).

Almost surely, 2^6539666025 is an apocalyptic number.

It is an amenable number.

6539666025 is a deficient number, since it is larger than the sum of its proper divisors (4856658135).

6539666025 is a wasteful number, since it uses less digits than its factorization.

6539666025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56826 (or 56821 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 48.

The square root of 6539666025 is about 80868.2015689727. The cubic root of 6539666025 is about 1870.0441356699.

The spelling of 6539666025 in words is "six billion, five hundred thirty-nine million, six hundred sixty-six thousand, twenty-five".