256401437550 has 48 divisors (see below), whose sum is σ = 635909684592. Its totient is φ = 68370048000.

The previous prime is 256401437531. The next prime is 256401437599. The reversal of 256401437550 is 55734104652.

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, 3869700 + ... + 3935400.

It is an arithmetic number, because the mean of its divisors is an integer number (13248118429).

Almost surely, 2^256401437550 is an apocalyptic number.

256401437550 is an abundant number, since it is smaller than the sum of its proper divisors (379508247042).

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

256401437550 is a wasteful number, since it uses less digits than its factorization.

256401437550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91733 (or 91728 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 42.

The spelling of 256401437550 in words is "two hundred fifty-six billion, four hundred one million, four hundred thirty-seven thousand, five hundred fifty".