857445877261 has 2 divisors, whose sum is σ = 857445877262. Its totient is φ = 857445877260.

The previous prime is 857445877181. The next prime is 857445877273. The reversal of 857445877261 is 162778544758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 711812816100 + 145633061161 = 843690^2 + 381619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857445877261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 857445877193 and 857445877202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857445877661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428722938630 + 428722938631.

It is an arithmetic number, because the mean of its divisors is an integer number (428722938631).

Almost surely, 2^857445877261 is an apocalyptic number.

It is an amenable number.

857445877261 is a deficient number, since it is larger than the sum of its proper divisors (1).

857445877261 is an equidigital number, since it uses as much as digits as its factorization.

857445877261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105369600, while the sum is 64.

The spelling of 857445877261 in words is "eight hundred fifty-seven billion, four hundred forty-five million, eight hundred seventy-seven thousand, two hundred sixty-one".