878142233548261 has 4 divisors (see below), whose sum is σ = 957973345689024. Its totient is φ = 798311121407500.

The previous prime is 878142233548241. The next prime is 878142233548273. The reversal of 878142233548261 is 162845332241878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 878142233548261 - 2²³ = 878142225159653 is a prime.

It is a super-2 number, since 2×878142233548261² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 878142233548193 and 878142233548202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878142233548201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39915556070365 + ... + 39915556070386.

It is an arithmetic number, because the mean of its divisors is an integer number (239493336422256).

Almost surely, 2^{878142233548261} is an apocalyptic number.

It is an amenable number.

878142233548261 is a deficient number, since it is larger than the sum of its proper divisors (79831112140763).

878142233548261 is a wasteful number, since it uses less digits than its factorization.

878142233548261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79831112140762.

The product of its digits is 123863040, while the sum is 64.

The spelling of 878142233548261 in words is "eight hundred seventy-eight trillion, one hundred forty-two billion, two hundred thirty-three million, five hundred forty-eight thousand, two hundred sixty-one".