6845555566 has 4 divisors (see below), whose sum is σ = 10268333352. Its totient is φ = 3422777782.

The previous prime is 6845555537. The next prime is 6845555579. The reversal of 6845555566 is 6655555486.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1711388890 + ... + 1711388893.

It is an arithmetic number, because the mean of its divisors is an integer number (2567083338).

Almost surely, 2^6845555566 is an apocalyptic number.

6845555566 is a deficient number, since it is larger than the sum of its proper divisors (3422777786).

6845555566 is a wasteful number, since it uses less digits than its factorization.

6845555566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422777785.

The product of its digits is 21600000, while the sum is 55.

The square root of 6845555566 is about 82737.8726219136. The cubic root of 6845555566 is about 1898.7577813671.

The spelling of 6845555566 in words is "six billion, eight hundred forty-five million, five hundred fifty-five thousand, five hundred sixty-six".