878555659969 has 9 divisors (see below), whose sum is σ = 951348613449. Its totient is φ = 810963207600.

The previous prime is 878555659967. The next prime is 878555659973. The reversal of 878555659969 is 969956555878.

The square root of 878555659969 is 937313.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 404782250625 + 473773409344 = 636225^2 + 688312^2 .

It is not a de Polignac number, because 878555659969 - 2¹ = 878555659967 is a prime.

It is a super-2 number, since 2×878555659969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 878555659892 and 878555659901.

It is not an unprimeable number, because it can be changed into a prime (878555659967) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12149019 + ... + 12221119.

Almost surely, 2^878555659969 is an apocalyptic number.

878555659969 is the 937313-rd square number.

878555659969 is the 468657-th centered octagonal number.

It is an amenable number.

878555659969 is a deficient number, since it is larger than the sum of its proper divisors (72792953480).

878555659969 is an frugal number, since it uses more digits than its factorization.

878555659969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144228 (or 72114 counting only the distinct ones).

The product of its digits is 7348320000, while the sum is 82.

The spelling of 878555659969 in words is "eight hundred seventy-eight billion, five hundred fifty-five million, six hundred fifty-nine thousand, nine hundred sixty-nine".