256699668324 has 96 divisors (see below), whose sum is σ = 675386772480. Its totient is φ = 75215606400.

The previous prime is 256699668299. The next prime is 256699668331. The reversal of 256699668324 is 423866996652.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204897 + ... + 745239.

It is an arithmetic number, because the mean of its divisors is an integer number (7035278880).

Almost surely, 2^256699668324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256699668324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337693386240).

256699668324 is an abundant number, since it is smaller than the sum of its proper divisors (418687104156).

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

256699668324 is a wasteful number, since it uses less digits than its factorization.

256699668324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540481 (or 540479 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 66.

The spelling of 256699668324 in words is "two hundred fifty-six billion, six hundred ninety-nine million, six hundred sixty-eight thousand, three hundred twenty-four".