256506400515346 has 16 divisors (see below), whose sum is σ = 395173077884928. Its totient is φ = 124798376087200.

The previous prime is 256506400515331. The next prime is 256506400515347. The reversal of 256506400515346 is 643515004605652.

It is a junction number, because it is equal to n+sod(n) for n = 256506400515293 and 256506400515302.

It is not an unprimeable number, because it can be changed into a prime (256506400515347) 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, 4083685090 + ... + 4083747901.

It is an arithmetic number, because the mean of its divisors is an integer number (24698317367808).

Almost surely, 2^{256506400515346} is an apocalyptic number.

256506400515346 is a deficient number, since it is larger than the sum of its proper divisors (138666677369582).

256506400515346 is a wasteful number, since it uses less digits than its factorization.

256506400515346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8167433417.

The product of its (nonzero) digits is 12960000, while the sum is 52.

The spelling of 256506400515346 in words is "two hundred fifty-six trillion, five hundred six billion, four hundred million, five hundred fifteen thousand, three hundred forty-six".