256349206069 has 16 divisors (see below), whose sum is σ = 290992538880. Its totient is φ = 223782794560.

The previous prime is 256349206039. The next prime is 256349206097. The reversal of 256349206069 is 960602943652.

It is a cyclic number.

It is not a de Polignac number, because 256349206069 - 2¹¹ = 256349204021 is a prime.

It is a super-2 number, since 2×256349206069² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256349206039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4650334 + ... + 4705135.

It is an arithmetic number, because the mean of its divisors is an integer number (18187033680).

Almost surely, 2^256349206069 is an apocalyptic number.

It is an amenable number.

256349206069 is a deficient number, since it is larger than the sum of its proper divisors (34643332811).

256349206069 is a wasteful number, since it uses less digits than its factorization.

256349206069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9355580.

The product of its (nonzero) digits is 4199040, while the sum is 52.

The spelling of 256349206069 in words is "two hundred fifty-six billion, three hundred forty-nine million, two hundred six thousand, sixty-nine".