256265415420 has 48 divisors (see below), whose sum is σ = 820049330688. Its totient is φ = 58574952000.

The previous prime is 256265415407. The next prime is 256265415421. The reversal of 256265415420 is 24514562652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256265415421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305077456 + ... + 305078295.

It is an arithmetic number, because the mean of its divisors is an integer number (17084361056).

Almost surely, 2^256265415420 is an apocalyptic number.

256265415420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256265415420 is an abundant number, since it is smaller than the sum of its proper divisors (563783915268).

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

256265415420 is a wasteful number, since it uses less digits than its factorization.

256265415420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610155770 (or 610155768 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 256265415420 in words is "two hundred fifty-six billion, two hundred sixty-five million, four hundred fifteen thousand, four hundred twenty".