256683315076440 has 96 divisors (see below), whose sum is σ = 895772385287280. Its totient is φ = 58670472016128.

The previous prime is 256683315076421. The next prime is 256683315076541. The reversal of 256683315076440 is 44670513386652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21826806627 + ... + 21826818386.

Almost surely, 2^{256683315076440} is an apocalyptic number.

256683315076440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256683315076440 is an abundant number, since it is smaller than the sum of its proper divisors (639089070210840).

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

256683315076440 is a wasteful number, since it uses less digits than its factorization.

256683315076440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43653625041 (or 43653625030 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 60.

The spelling of 256683315076440 in words is "two hundred fifty-six trillion, six hundred eighty-three billion, three hundred fifteen million, seventy-six thousand, four hundred forty".