256520516370 has 32 divisors (see below), whose sum is σ = 616210530048. Its totient is φ = 68343105408.

The previous prime is 256520516359. The next prime is 256520516407. The reversal of 256520516370 is 73615025652.

It is a Curzon 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, 3864394 + ... + 3930213.

It is an arithmetic number, because the mean of its divisors is an integer number (19256579064).

Almost surely, 2^256520516370 is an apocalyptic number.

256520516370 is an abundant number, since it is smaller than the sum of its proper divisors (359690013678).

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

256520516370 is a wasteful number, since it uses less digits than its factorization.

256520516370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7795714.

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 256520516370 in words is "two hundred fifty-six billion, five hundred twenty million, five hundred sixteen thousand, three hundred seventy".