256561435030 has 8 divisors (see below), whose sum is σ = 461810583072. Its totient is φ = 102624574008.

The previous prime is 256561435003. The next prime is 256561435049. The reversal of 256561435030 is 30534165652.

256561435030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×256561435030² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12828071742 + ... + 12828071761.

It is an arithmetic number, because the mean of its divisors is an integer number (57726322884).

Almost surely, 2^256561435030 is an apocalyptic number.

256561435030 is a deficient number, since it is larger than the sum of its proper divisors (205249148042).

256561435030 is a wasteful number, since it uses less digits than its factorization.

256561435030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25656143510.

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 256561435030 in words is "two hundred fifty-six billion, five hundred sixty-one million, four hundred thirty-five thousand, thirty".