678923372809 has 16 divisors (see below), whose sum is σ = 746782235136. Its totient is φ = 612096451200.

The previous prime is 678923372807. The next prime is 678923372851. The reversal of 678923372809 is 908273329876.

It is a cyclic number.

It is not a de Polignac number, because 678923372809 - 2¹ = 678923372807 is a prime.

It is a super-2 number, since 2×678923372809² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678923372807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1318024 + ... + 1759270.

It is an arithmetic number, because the mean of its divisors is an integer number (46673889696).

Almost surely, 2^678923372809 is an apocalyptic number.

It is an amenable number.

678923372809 is a deficient number, since it is larger than the sum of its proper divisors (67858862327).

678923372809 is a wasteful number, since it uses less digits than its factorization.

678923372809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442416.

The product of its (nonzero) digits is 54867456, while the sum is 64.

The spelling of 678923372809 in words is "six hundred seventy-eight billion, nine hundred twenty-three million, three hundred seventy-two thousand, eight hundred nine".