256412433563 has 8 divisors (see below), whose sum is σ = 301239782256. Its totient is φ = 215171272800.

The previous prime is 256412433547. The next prime is 256412433587. The reversal of 256412433563 is 365334214652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256412433563 - 2⁴ = 256412433547 is a prime.

It is a super-3 number, since 3×256412433563³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256412433863) 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, 896546828 + ... + 896547113.

It is an arithmetic number, because the mean of its divisors is an integer number (37654972782).

Almost surely, 2^256412433563 is an apocalyptic number.

256412433563 is a deficient number, since it is larger than the sum of its proper divisors (44827348693).

256412433563 is a wasteful number, since it uses less digits than its factorization.

256412433563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793093965.

The product of its digits is 1555200, while the sum is 44.

Subtracting 256412433563 from its reverse (365334214652), we obtain a square (108921781089 = 330033²).

The spelling of 256412433563 in words is "two hundred fifty-six billion, four hundred twelve million, four hundred thirty-three thousand, five hundred sixty-three".