878361280386861 has 4 divisors (see below), whose sum is σ = 1171148373849152. Its totient is φ = 585574186924572.

The previous prime is 878361280386739. The next prime is 878361280386871. The reversal of 878361280386861 is 168683082163878.

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 878361280386861 - 2²⁹ = 878360743515949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878361280386871) 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, 146393546731141 + ... + 146393546731146.

It is an arithmetic number, because the mean of its divisors is an integer number (292787093462288).

Almost surely, 2^{878361280386861} is an apocalyptic number.

It is an amenable number.

878361280386861 is a deficient number, since it is larger than the sum of its proper divisors (292787093462291).

878361280386861 is a wasteful number, since it uses less digits than its factorization.

878361280386861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292787093462290.

The product of its (nonzero) digits is 891813888, while the sum is 75.

The spelling of 878361280386861 in words is "eight hundred seventy-eight trillion, three hundred sixty-one billion, two hundred eighty million, three hundred eighty-six thousand, eight hundred sixty-one".