878140321418261 has 16 divisors (see below), whose sum is σ = 999623378723328. Its totient is φ = 763599366908400.

The previous prime is 878140321418249. The next prime is 878140321418299. The reversal of 878140321418261 is 162814123041878.

It is not a de Polignac number, because 878140321418261 - 2¹⁴ = 878140321401877 is a prime.

It is a super-2 number, since 2×878140321418261² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 878140321418197 and 878140321418206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878140321411261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292637690 + ... + 295623236.

It is an arithmetic number, because the mean of its divisors is an integer number (62476461170208).

Almost surely, 2^{878140321418261} is an apocalyptic number.

It is an amenable number.

878140321418261 is a deficient number, since it is larger than the sum of its proper divisors (121483057305067).

878140321418261 is a wasteful number, since it uses less digits than its factorization.

878140321418261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148152.

The product of its (nonzero) digits is 4128768, while the sum is 56.

The spelling of 878140321418261 in words is "eight hundred seventy-eight trillion, one hundred forty billion, three hundred twenty-one million, four hundred eighteen thousand, two hundred sixty-one".