856307948641 has 2 divisors, whose sum is σ = 856307948642. Its totient is φ = 856307948640.

The previous prime is 856307948633. The next prime is 856307948647. The reversal of 856307948641 is 146849703658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624422361616 + 231885587025 = 790204^2 + 481545^2 .

It is a cyclic number.

It is not a de Polignac number, because 856307948641 - 2³ = 856307948633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856307948641.

It is not a weakly prime, because it can be changed into another prime (856307948647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428153974320 + 428153974321.

It is an arithmetic number, because the mean of its divisors is an integer number (428153974321).

Almost surely, 2^856307948641 is an apocalyptic number.

It is an amenable number.

856307948641 is a deficient number, since it is larger than the sum of its proper divisors (1).

856307948641 is an equidigital number, since it uses as much as digits as its factorization.

856307948641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 856307948641 in words is "eight hundred fifty-six billion, three hundred seven million, nine hundred forty-eight thousand, six hundred forty-one".