159728490781 has 2 divisors, whose sum is σ = 159728490782. Its totient is φ = 159728490780.

The previous prime is 159728490737. The next prime is 159728490821. The reversal of 159728490781 is 187094827951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155007564100 + 4720926681 = 393710^2 + 68709^2 .

It is a cyclic number.

It is not a de Polignac number, because 159728490781 - 2¹⁵ = 159728458013 is a prime.

It is a super-2 number, since 2×159728490781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159728490281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79864245390 + 79864245391.

It is an arithmetic number, because the mean of its divisors is an integer number (79864245391).

Almost surely, 2^159728490781 is an apocalyptic number.

It is an amenable number.

159728490781 is a deficient number, since it is larger than the sum of its proper divisors (1).

159728490781 is an equidigital number, since it uses as much as digits as its factorization.

159728490781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10160640, while the sum is 61.

The spelling of 159728490781 in words is "one hundred fifty-nine billion, seven hundred twenty-eight million, four hundred ninety thousand, seven hundred eighty-one".