159649744257 has 20 divisors (see below), whose sum is σ = 239072276740. Its totient is φ = 106172913024.

The previous prime is 159649744253. The next prime is 159649744273. The reversal of 159649744257 is 752447946951.

159649744257 is a `hidden beast` number, since 1 + 5 + 96 + 497 + 4 + 4 + 2 + 57 = 666.

159649744257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 79537536576 + 80112207681 = 282024^2 + 283041^2 .

It is not a de Polignac number, because 159649744257 - 2² = 159649744253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 159649744194 and 159649744203.

It is not an unprimeable number, because it can be changed into a prime (159649744253) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 2376388 + ... + 2442645.

It is an arithmetic number, because the mean of its divisors is an integer number (11953613837).

Almost surely, 2^159649744257 is an apocalyptic number.

It is an amenable number.

159649744257 is a deficient number, since it is larger than the sum of its proper divisors (79422532483).

159649744257 is an equidigital number, since it uses as much as digits as its factorization.

159649744257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4819454 (or 4819445 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 63.

The spelling of 159649744257 in words is "one hundred fifty-nine billion, six hundred forty-nine million, seven hundred forty-four thousand, two hundred fifty-seven".