159936121381 has 4 divisors (see below), whose sum is σ = 168353812000. Its totient is φ = 151518430764.

The previous prime is 159936121379. The next prime is 159936121391. The reversal of 159936121381 is 183121639951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183121639951 = 1609 ⋅113810839.

It is a cyclic number.

It is not a de Polignac number, because 159936121381 - 2¹ = 159936121379 is a prime.

It is a super-4 number, since 4×159936121381⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159936121391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4208845281 + ... + 4208845318.

It is an arithmetic number, because the mean of its divisors is an integer number (42088453000).

Almost surely, 2^159936121381 is an apocalyptic number.

It is an amenable number.

159936121381 is a deficient number, since it is larger than the sum of its proper divisors (8417690619).

159936121381 is an equidigital number, since it uses as much as digits as its factorization.

159936121381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8417690618.

The product of its digits is 349920, while the sum is 49.

The spelling of 159936121381 in words is "one hundred fifty-nine billion, nine hundred thirty-six million, one hundred twenty-one thousand, three hundred eighty-one".