255851856749 has 8 divisors (see below), whose sum is σ = 262110754752. Its totient is φ = 249593844960.

The previous prime is 255851856721. The next prime is 255851856763. The reversal of 255851856749 is 947658158552.

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 255851856749 - 2⁸ = 255851856493 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 (255851856709) 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, 382832 + ... + 811334.

It is an arithmetic number, because the mean of its divisors is an integer number (32763844344).

Almost surely, 2^255851856749 is an apocalyptic number.

It is an amenable number.

255851856749 is a deficient number, since it is larger than the sum of its proper divisors (6258898003).

255851856749 is a wasteful number, since it uses less digits than its factorization.

255851856749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443107.

The product of its digits is 120960000, while the sum is 65.

The spelling of 255851856749 in words is "two hundred fifty-five billion, eight hundred fifty-one million, eight hundred fifty-six thousand, seven hundred forty-nine".