856565616 has 40 divisors (see below), whose sum is σ = 2214032400. Its totient is φ = 285362176.

The previous prime is 856565579. The next prime is 856565623. The reversal of 856565616 is 616565658.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an alternating number because its digits alternate between even and odd.

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, 108160 + ... + 115808.

It is an arithmetic number, because the mean of its divisors is an integer number (55350810).

Almost surely, 2^856565616 is an apocalyptic number.

It is an amenable number.

856565616 is an abundant number, since it is smaller than the sum of its proper divisors (1357466784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856565616 is a wasteful number, since it uses less digits than its factorization.

856565616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9993 (or 9987 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 48.

The square root of 856565616 is about 29267.1422588540. The cubic root of 856565616 is about 949.7009644223.

The spelling of 856565616 in words is "eight hundred fifty-six million, five hundred sixty-five thousand, six hundred sixteen".