878337584661 has 4 divisors (see below), whose sum is σ = 1171116779552. Its totient is φ = 585558389772.

The previous prime is 878337584653. The next prime is 878337584671. The reversal of 878337584661 is 166485733878.

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 not a de Polignac number, because 878337584661 - 2³ = 878337584653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 878337584592 and 878337584601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878337584671) 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, 146389597441 + ... + 146389597446.

It is an arithmetic number, because the mean of its divisors is an integer number (292779194888).

Almost surely, 2^878337584661 is an apocalyptic number.

It is an amenable number.

878337584661 is a deficient number, since it is larger than the sum of its proper divisors (292779194891).

878337584661 is a wasteful number, since it uses less digits than its factorization.

878337584661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292779194890.

The product of its digits is 162570240, while the sum is 66.

The spelling of 878337584661 in words is "eight hundred seventy-eight billion, three hundred thirty-seven million, five hundred eighty-four thousand, six hundred sixty-one".