256515705012405 has 16 divisors (see below), whose sum is σ = 410425600832640. Its totient is φ = 136808218402368.

The previous prime is 256515705012397. The next prime is 256515705012461. The reversal of 256515705012405 is 504210507515652.

It is a happy number.

256515705012405 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256515705012405 - 2³ = 256515705012397 is a prime.

It is a super-2 number, since 2×256515705012405² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4256176 + ... + 23046614.

It is an arithmetic number, because the mean of its divisors is an integer number (25651600052040).

Almost surely, 2^{256515705012405} is an apocalyptic number.

It is an amenable number.

256515705012405 is a deficient number, since it is larger than the sum of its proper divisors (153909895820235).

256515705012405 is a wasteful number, since it uses less digits than its factorization.

256515705012405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19700540.

The product of its (nonzero) digits is 2100000, while the sum is 48.

The spelling of 256515705012405 in words is "two hundred fifty-six trillion, five hundred fifteen billion, seven hundred five million, twelve thousand, four hundred five".