675999684864 has 243 divisors, whose sum is σ = 2268216803307. Its totient is φ = 193063836672.

The previous prime is 675999684823. The next prime is 675999684907. The reversal of 675999684864 is 468486999576.

The square root of 675999684864 is 822192.

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

675999684864 is a `hidden beast` number, since 6 + 75 + 9 + 9 + 9 + 68 + 486 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 276255289 + ... + 276257735.

Almost surely, 2^675999684864 is an apocalyptic number.

675999684864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

675999684864 is the 822192-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 675999684864

675999684864 is an abundant number, since it is smaller than the sum of its proper divisors (1592217118443).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

675999684864 is an frugal number, since it uses more digits than its factorization.

675999684864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4930 (or 2459 counting only the distinct ones).

The product of its digits is 5643509760, while the sum is 81.

Multiplying 675999684864 by its sum of digits (81), we get a square (54755974473984 = 7399728²).

The spelling of 675999684864 in words is "six hundred seventy-five billion, nine hundred ninety-nine million, six hundred eighty-four thousand, eight hundred sixty-four".