256207266129 has 8 divisors (see below), whose sum is σ = 345933861760. Its totient is φ = 168642757296.

The previous prime is 256207266041. The next prime is 256207266143. The reversal of 256207266129 is 921662702652.

It is a happy number.

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

It is not a de Polignac number, because 256207266129 - 2⁹ = 256207265617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256207266179) 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, 540521422 + ... + 540521895.

It is an arithmetic number, because the mean of its divisors is an integer number (43241732720).

Almost surely, 2^256207266129 is an apocalyptic number.

It is an amenable number.

256207266129 is a deficient number, since it is larger than the sum of its proper divisors (89726595631).

256207266129 is a wasteful number, since it uses less digits than its factorization.

256207266129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081043399.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 256207266129 in words is "two hundred fifty-six billion, two hundred seven million, two hundred sixty-six thousand, one hundred twenty-nine".