856707745477 has 2 divisors, whose sum is σ = 856707745478. Its totient is φ = 856707745476.

The previous prime is 856707745429. The next prime is 856707745499. The reversal of 856707745477 is 774547707658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686563045281 + 170144700196 = 828591^2 + 412486^2 .

It is a cyclic number.

It is not a de Polignac number, because 856707745477 - 2⁷ = 856707745349 is a prime.

It is a super-3 number, since 3×856707745477³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856707745177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428353872738 + 428353872739.

It is an arithmetic number, because the mean of its divisors is an integer number (428353872739).

Almost surely, 2^856707745477 is an apocalyptic number.

It is an amenable number.

856707745477 is a deficient number, since it is larger than the sum of its proper divisors (1).

856707745477 is an equidigital number, since it uses as much as digits as its factorization.

856707745477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322694400, while the sum is 67.

The spelling of 856707745477 in words is "eight hundred fifty-six billion, seven hundred seven million, seven hundred forty-five thousand, four hundred seventy-seven".