6539415866 has 4 divisors (see below), whose sum is σ = 9809123802. Its totient is φ = 3269707932.

The previous prime is 6539415859. The next prime is 6539415889. The reversal of 6539415866 is 6685149356.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3496238641 + 3043177225 = 59129^2 + 55165^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1634853965 + ... + 1634853968.

Almost surely, 2^6539415866 is an apocalyptic number.

6539415866 is a deficient number, since it is larger than the sum of its proper divisors (3269707936).

6539415866 is a wasteful number, since it uses less digits than its factorization.

6539415866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269707935.

The product of its digits is 4665600, while the sum is 53.

The square root of 6539415866 is about 80866.6548461107. The cubic root of 6539415866 is about 1870.0202907042.

The spelling of 6539415866 in words is "six billion, five hundred thirty-nine million, four hundred fifteen thousand, eight hundred sixty-six".