256736142345 has 16 divisors (see below), whose sum is σ = 410784544512. Its totient is φ = 136923703680.

The previous prime is 256736142329. The next prime is 256736142347. The reversal of 256736142345 is 543241637652.

It is a happy number.

It is not a de Polignac number, because 256736142345 - 2⁴ = 256736142329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256736142294 and 256736142303.

It is not an unprimeable number, because it can be changed into a prime (256736142347) 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, 1259424 + ... + 1449006.

It is an arithmetic number, because the mean of its divisors is an integer number (25674034032).

Almost surely, 2^256736142345 is an apocalyptic number.

It is an amenable number.

256736142345 is a deficient number, since it is larger than the sum of its proper divisors (154048402167).

256736142345 is a wasteful number, since it uses less digits than its factorization.

256736142345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279872.

The product of its digits is 3628800, while the sum is 48.

Adding to 256736142345 its reverse (543241637652), we get a palindrome (799977779997).

The spelling of 256736142345 in words is "two hundred fifty-six billion, seven hundred thirty-six million, one hundred forty-two thousand, three hundred forty-five".