856532557 has 8 divisors (see below), whose sum is σ = 864500472. Its totient is φ = 848601600.

The previous prime is 856532543. The next prime is 856532561. The reversal of 856532557 is 755235658.

It is a happy number.

856532557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 236821321 + 619711236 = 15389^2 + 24894^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 856532557 - 2¹⁹ = 856008269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856532507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38457 + ... + 56497.

It is an arithmetic number, because the mean of its divisors is an integer number (108062559).

Almost surely, 2^856532557 is an apocalyptic number.

It is an amenable number.

856532557 is a deficient number, since it is larger than the sum of its proper divisors (7967915).

856532557 is a wasteful number, since it uses less digits than its factorization.

856532557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18479.

The product of its digits is 1260000, while the sum is 46.

The square root of 856532557 is about 29266.5774732885. The cubic root of 856532557 is about 949.6887464176.

The spelling of 856532557 in words is "eight hundred fifty-six million, five hundred thirty-two thousand, five hundred fifty-seven".