256065942789 has 32 divisors (see below), whose sum is σ = 403272535680. Its totient is φ = 160028640000.

The previous prime is 256065942787. The next prime is 256065942817. The reversal of 256065942789 is 987249560652.

256065942789 is a `hidden beast` number, since 2 + 560 + 65 + 9 + 4 + 2 + 7 + 8 + 9 = 666.

It is not a de Polignac number, because 256065942789 - 2¹ = 256065942787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256065942787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 996102 + ... + 1226519.

It is an arithmetic number, because the mean of its divisors is an integer number (12602266740).

Almost surely, 2^256065942789 is an apocalyptic number.

It is an amenable number.

256065942789 is a deficient number, since it is larger than the sum of its proper divisors (147206592891).

256065942789 is a wasteful number, since it uses less digits than its factorization.

256065942789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222898 (or 2222892 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 63.

The spelling of 256065942789 in words is "two hundred fifty-six billion, sixty-five million, nine hundred forty-two thousand, seven hundred eighty-nine".