256464133390 has 16 divisors (see below), whose sum is σ = 461953178208. Its totient is φ = 102515044896.

The previous prime is 256464133307. The next prime is 256464133397. The reversal of 256464133390 is 93331464652.

It is a self number, because there is not a number n which added to its sum of digits gives 256464133390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256464133397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8810802 + ... + 8839861.

It is an arithmetic number, because the mean of its divisors is an integer number (28872073638).

Almost surely, 2^256464133390 is an apocalyptic number.

256464133390 is a deficient number, since it is larger than the sum of its proper divisors (205489044818).

256464133390 is a wasteful number, since it uses less digits than its factorization.

256464133390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17652123.

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 256464133390 in words is "two hundred fifty-six billion, four hundred sixty-four million, one hundred thirty-three thousand, three hundred ninety".