159778597257 has 12 divisors (see below), whose sum is σ = 232608563200. Its totient is φ = 105680331288.

The previous prime is 159778597249. The next prime is 159778597291. The reversal of 159778597257 is 752795877951.

159778597257 is a `hidden beast` number, since 1 + 5 + 9 + 7 + 7 + 8 + 597 + 25 + 7 = 666.

159778597257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 159778597257 - 2³ = 159778597249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159778599257) 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 11 ways as a sum of consecutive naturals, for example, 69893257 + ... + 69895542.

Almost surely, 2^159778597257 is an apocalyptic number.

It is an amenable number.

159778597257 is a deficient number, since it is larger than the sum of its proper divisors (72829965943).

159778597257 is a wasteful number, since it uses less digits than its factorization.

159778597257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139788932 (or 139788929 counting only the distinct ones).

The product of its digits is 388962000, while the sum is 72.

The spelling of 159778597257 in words is "one hundred fifty-nine billion, seven hundred seventy-eight million, five hundred ninety-seven thousand, two hundred fifty-seven".