159394081621 has 4 divisors (see below), whose sum is σ = 159425297632. Its totient is φ = 159362865612.

The previous prime is 159394081579. The next prime is 159394081673. The reversal of 159394081621 is 126180493951.

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.

It is a cyclic number.

It is not a de Polignac number, because 159394081621 - 2¹³ = 159394073429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159394021621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15600345 + ... + 15610558.

It is an arithmetic number, because the mean of its divisors is an integer number (39856324408).

Almost surely, 2^159394081621 is an apocalyptic number.

It is an amenable number.

159394081621 is a deficient number, since it is larger than the sum of its proper divisors (31216011).

159394081621 is an equidigital number, since it uses as much as digits as its factorization.

159394081621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31216010.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 159394081621 in words is "one hundred fifty-nine billion, three hundred ninety-four million, eighty-one thousand, six hundred twenty-one".