678399953201 has 4 divisors (see below), whose sum is σ = 691199952372. Its totient is φ = 665599954032.

The previous prime is 678399953117. The next prime is 678399953213. The reversal of 678399953201 is 102359993876.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 471694240000 + 206705713201 = 686800^2 + 454649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678399953201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678399953501) 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, 6399999506 + ... + 6399999611.

It is an arithmetic number, because the mean of its divisors is an integer number (172799988093).

Almost surely, 2^678399953201 is an apocalyptic number.

It is an amenable number.

678399953201 is a deficient number, since it is larger than the sum of its proper divisors (12799999171).

678399953201 is a wasteful number, since it uses less digits than its factorization.

678399953201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12799999170.

The product of its (nonzero) digits is 22044960, while the sum is 62.

The spelling of 678399953201 in words is "six hundred seventy-eight billion, three hundred ninety-nine million, nine hundred fifty-three thousand, two hundred one".