8315661549566 has 16 divisors (see below), whose sum is σ = 14256353295456. Its totient is φ = 3563621575776.

The previous prime is 8315661549541. The next prime is 8315661549577. The reversal of 8315661549566 is 6659451665138.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19226321 + ... + 19654076.

It is an arithmetic number, because the mean of its divisors is an integer number (891022080966).

Almost surely, 2^{8315661549566} is an apocalyptic number.

8315661549566 is a deficient number, since it is larger than the sum of its proper divisors (5940691745890).

8315661549566 is a wasteful number, since it uses less digits than its factorization.

8315661549566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38895683.

The product of its digits is 139968000, while the sum is 65.

The spelling of 8315661549566 in words is "eight trillion, three hundred fifteen billion, six hundred sixty-one million, five hundred forty-nine thousand, five hundred sixty-six".