851709126377 has 2 divisors, whose sum is σ = 851709126378. Its totient is φ = 851709126376.

The previous prime is 851709126311. The next prime is 851709126379. The reversal of 851709126377 is 773621907158.

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., 850371688336 + 1337438041 = 922156^2 + 36571^2 .

It is a cyclic number.

It is not a de Polignac number, because 851709126377 - 2¹⁰ = 851709125353 is a prime.

It is a super-2 number, since 2×851709126377² (a number of 25 digits) contains 22 as substring.

Together with 851709126379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (851709126379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425854563188 + 425854563189.

It is an arithmetic number, because the mean of its divisors is an integer number (425854563189).

Almost surely, 2^851709126377 is an apocalyptic number.

It is an amenable number.

851709126377 is a deficient number, since it is larger than the sum of its proper divisors (1).

851709126377 is an equidigital number, since it uses as much as digits as its factorization.

851709126377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The spelling of 851709126377 in words is "eight hundred fifty-one billion, seven hundred nine million, one hundred twenty-six thousand, three hundred seventy-seven".