878656721613 has 16 divisors (see below), whose sum is σ = 1299707942400. Its totient is φ = 523493474480.

The previous prime is 878656721491. The next prime is 878656721641. The reversal of 878656721613 is 316127656878.

It is a cyclic number.

It is not a de Polignac number, because 878656721613 - 2¹⁴ = 878656705229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878656721413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225641793 + ... + 225645686.

It is an arithmetic number, because the mean of its divisors is an integer number (81231746400).

Almost surely, 2^878656721613 is an apocalyptic number.

It is an amenable number.

878656721613 is a deficient number, since it is larger than the sum of its proper divisors (421051220787).

878656721613 is a wasteful number, since it uses less digits than its factorization.

878656721613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451287552.

The product of its digits is 20321280, while the sum is 60.

The spelling of 878656721613 in words is "eight hundred seventy-eight billion, six hundred fifty-six million, seven hundred twenty-one thousand, six hundred thirteen".