856649009252 has 6 divisors (see below), whose sum is σ = 1499135766198. Its totient is φ = 428324504624.

The previous prime is 856649009197. The next prime is 856649009267. The reversal of 856649009252 is 252900946658.

It can be written as a sum of positive squares in only one way, i.e., 518941581376 + 337707427876 = 720376^2 + 581126^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107081126153 + ... + 107081126160.

It is an arithmetic number, because the mean of its divisors is an integer number (249855961033).

Almost surely, 2^856649009252 is an apocalyptic number.

It is an amenable number.

856649009252 is a deficient number, since it is larger than the sum of its proper divisors (642486756946).

856649009252 is a wasteful number, since it uses less digits than its factorization.

856649009252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214162252317 (or 214162252315 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 856649009252 in words is "eight hundred fifty-six billion, six hundred forty-nine million, nine thousand, two hundred fifty-two".