256607505797 has 8 divisors (see below), whose sum is σ = 258245699712. Its totient is φ = 254970522000.

The previous prime is 256607505793. The next prime is 256607505799. The reversal of 256607505797 is 797505706652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256607505797 - 2² = 256607505793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256607505793) 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, 124847 + ... + 727187.

It is an arithmetic number, because the mean of its divisors is an integer number (32280712464).

Almost surely, 2^256607505797 is an apocalyptic number.

It is an amenable number.

256607505797 is a deficient number, since it is larger than the sum of its proper divisors (1638193915).

256607505797 is a wasteful number, since it uses less digits than its factorization.

256607505797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605059.

The product of its (nonzero) digits is 27783000, while the sum is 59.

The spelling of 256607505797 in words is "two hundred fifty-six billion, six hundred seven million, five hundred five thousand, seven hundred ninety-seven".