685442566 has 8 divisors (see below), whose sum is σ = 1036012824. Its totient is φ = 340104960.

The previous prime is 685442557. The next prime is 685442599. The reversal of 685442566 is 665244586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×685442566² = 939663022569328712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307835 + ... + 1308358.

It is an arithmetic number, because the mean of its divisors is an integer number (129501603).

Almost surely, 2^685442566 is an apocalyptic number.

685442566 is a deficient number, since it is larger than the sum of its proper divisors (350570258).

685442566 is a wasteful number, since it uses less digits than its factorization.

685442566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616326.

The product of its digits is 1382400, while the sum is 46.

The square root of 685442566 is about 26180.9580802537. The cubic root of 685442566 is about 881.7057848757.

The spelling of 685442566 in words is "six hundred eighty-five million, four hundred forty-two thousand, five hundred sixty-six".