256621643330132 has 24 divisors (see below), whose sum is σ = 479511422529216. Its totient is φ = 119877855628608.

The previous prime is 256621643330131. The next prime is 256621643330153. The reversal of 256621643330132 is 231033346126652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256621643330131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32434480793 + ... + 32434488704.

It is an arithmetic number, because the mean of its divisors is an integer number (19979642605384).

Almost surely, 2^{256621643330132} is an apocalyptic number.

It is an amenable number.

256621643330132 is a deficient number, since it is larger than the sum of its proper divisors (222889779199084).

256621643330132 is a wasteful number, since it uses less digits than its factorization.

256621643330132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64868969567 (or 64868969565 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 47.

Adding to 256621643330132 its reverse (231033346126652), we get a palindrome (487654989456784).

The spelling of 256621643330132 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, six hundred forty-three million, three hundred thirty thousand, one hundred thirty-two".