878140321411261 has 2 divisors, whose sum is σ = 878140321411262. Its totient is φ = 878140321411260.

The previous prime is 878140321411253. The next prime is 878140321411289. The reversal of 878140321411261 is 162114123041878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 877395880315161 + 744441096100 = 29620869^2 + 862810^2 .

It is a cyclic number.

It is not a de Polignac number, because 878140321411261 - 2³ = 878140321411253 is a prime.

It is a super-2 number, since 2×878140321411261² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878140321421261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439070160705630 + 439070160705631.

It is an arithmetic number, because the mean of its divisors is an integer number (439070160705631).

Almost surely, 2^{878140321411261} is an apocalyptic number.

It is an amenable number.

878140321411261 is a deficient number, since it is larger than the sum of its proper divisors (1).

878140321411261 is an equidigital number, since it uses as much as digits as its factorization.

878140321411261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 49.

The spelling of 878140321411261 in words is "eight hundred seventy-eight trillion, one hundred forty billion, three hundred twenty-one million, four hundred eleven thousand, two hundred sixty-one".