878840625425261 has 2 divisors, whose sum is σ = 878840625425262. Its totient is φ = 878840625425260.

The previous prime is 878840625425249. The next prime is 878840625425317. The reversal of 878840625425261 is 162524526048878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 860425240996036 + 18415384429225 = 29333006^2 + 4291315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878840625425261 is a prime.

It is a super-2 number, since 2×878840625425261² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 878840625425191 and 878840625425200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878840625421261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439420312712630 + 439420312712631.

It is an arithmetic number, because the mean of its divisors is an integer number (439420312712631).

Almost surely, 2^{878840625425261} is an apocalyptic number.

It is an amenable number.

878840625425261 is a deficient number, since it is larger than the sum of its proper divisors (1).

878840625425261 is an equidigital number, since it uses as much as digits as its factorization.

878840625425261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 412876800, while the sum is 68.

The spelling of 878840625425261 in words is "eight hundred seventy-eight trillion, eight hundred forty billion, six hundred twenty-five million, four hundred twenty-five thousand, two hundred sixty-one".