855140287517 has 2 divisors, whose sum is σ = 855140287518. Its totient is φ = 855140287516.

The previous prime is 855140287513. The next prime is 855140287537. The reversal of 855140287517 is 715782041558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 752060121796 + 103080165721 = 867214^2 + 321061^2 .

It is a cyclic number.

It is not a de Polignac number, because 855140287517 - 2² = 855140287513 is a prime.

It is a super-2 number, since 2×855140287517² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855140287513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427570143758 + 427570143759.

It is an arithmetic number, because the mean of its divisors is an integer number (427570143759).

Almost surely, 2^855140287517 is an apocalyptic number.

It is an amenable number.

855140287517 is a deficient number, since it is larger than the sum of its proper divisors (1).

855140287517 is an equidigital number, since it uses as much as digits as its factorization.

855140287517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136000, while the sum is 53.

The spelling of 855140287517 in words is "eight hundred fifty-five billion, one hundred forty million, two hundred eighty-seven thousand, five hundred seventeen".