256698526145 has 4 divisors (see below), whose sum is σ = 308038231380. Its totient is φ = 205358820912.

The previous prime is 256698526121. The next prime is 256698526159. The reversal of 256698526145 is 541625896652.

256698526145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 161185387441 + 95513138704 = 401479^2 + 309052^2 .

It is a cyclic number.

It is not a de Polignac number, because 256698526145 - 2²² = 256694331841 is a prime.

It is a super-2 number, since 2×256698526145² (a number of 24 digits) contains 22 as substring.

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, 25669852610 + ... + 25669852619.

It is an arithmetic number, because the mean of its divisors is an integer number (77009557845).

Almost surely, 2^256698526145 is an apocalyptic number.

It is an amenable number.

256698526145 is a deficient number, since it is larger than the sum of its proper divisors (51339705235).

256698526145 is an equidigital number, since it uses as much as digits as its factorization.

256698526145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51339705234.

The product of its digits is 31104000, while the sum is 59.

The spelling of 256698526145 in words is "two hundred fifty-six billion, six hundred ninety-eight million, five hundred twenty-six thousand, one hundred forty-five".