857551563901 has 2 divisors, whose sum is σ = 857551563902. Its totient is φ = 857551563900.

The previous prime is 857551563889. The next prime is 857551563943. The reversal of 857551563901 is 109365155758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 855856265625 + 1695298276 = 925125^2 + 41174^2 .

It is a cyclic number.

It is not a de Polignac number, because 857551563901 - 2³⁷ = 720112610429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857551563971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428775781950 + 428775781951.

It is an arithmetic number, because the mean of its divisors is an integer number (428775781951).

Almost surely, 2^857551563901 is an apocalyptic number.

It is an amenable number.

857551563901 is a deficient number, since it is larger than the sum of its proper divisors (1).

857551563901 is an equidigital number, since it uses as much as digits as its factorization.

857551563901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670000, while the sum is 55.

The spelling of 857551563901 in words is "eight hundred fifty-seven billion, five hundred fifty-one million, five hundred sixty-three thousand, nine hundred one".