870643725617161 has 4 divisors (see below), whose sum is σ = 870817889200000. Its totient is φ = 870469562034324.

The previous prime is 870643725617101. The next prime is 870643725617177. The reversal of 870643725617161 is 161716527346078.

It is a happy number.

870643725617161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 870643725617161 - 2²⁹ = 870643188746249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 870643725617093 and 870643725617102.

It is not an unprimeable number, because it can be changed into a prime (870643725617101) 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, 87081783921 + ... + 87081793918.

It is an arithmetic number, because the mean of its divisors is an integer number (217704472300000).

Almost surely, 2^{870643725617161} is an apocalyptic number.

It is an amenable number.

870643725617161 is a deficient number, since it is larger than the sum of its proper divisors (174163582839).

870643725617161 is a wasteful number, since it uses less digits than its factorization.

870643725617161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174163582838.

The product of its (nonzero) digits is 71124480, while the sum is 64.

The spelling of 870643725617161 in words is "eight hundred seventy trillion, six hundred forty-three billion, seven hundred twenty-five million, six hundred seventeen thousand, one hundred sixty-one".