678872179969 has 9 divisors (see below), whose sum is σ = 682834295073. Its totient is φ = 674932937172.

The previous prime is 678872179963. The next prime is 678872179981. The reversal of 678872179969 is 969971278876.

The square root of 678872179969 is 823937.

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

It is not a de Polignac number, because 678872179969 - 2³ = 678872179961 is a prime.

It is a super-2 number, since 2×678872179969² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678872179961) 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, 147482422 + ... + 147487024.

Almost surely, 2^678872179969 is an apocalyptic number.

678872179969 is the 823937-th square number.

678872179969 is the 411969-th centered octagonal number.

It is an amenable number.

678872179969 is a deficient number, since it is larger than the sum of its proper divisors (3962115104).

678872179969 is an frugal number, since it uses more digits than its factorization.

678872179969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9564 (or 4782 counting only the distinct ones).

The product of its digits is 1152216576, while the sum is 79.

The spelling of 678872179969 in words is "six hundred seventy-eight billion, eight hundred seventy-two million, one hundred seventy-nine thousand, nine hundred sixty-nine".