156561501616161 has 8 divisors (see below), whose sum is σ = 208748759854080. Its totient is φ = 104374288894512.

The previous prime is 156561501616133. The next prime is 156561501616213. The reversal of 156561501616161 is 161616105165651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 156561501616161 - 2¹⁰ = 156561501615137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156561501615161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2323681 + ... + 17847198.

It is an arithmetic number, because the mean of its divisors is an integer number (26093594981760).

Almost surely, 2^{156561501616161} is an apocalyptic number.

It is an amenable number.

156561501616161 is a deficient number, since it is larger than the sum of its proper divisors (52187258237919).

156561501616161 is a wasteful number, since it uses less digits than its factorization.

156561501616161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22758135.

The product of its (nonzero) digits is 972000, while the sum is 51.

The spelling of 156561501616161 in words is "one hundred fifty-six trillion, five hundred sixty-one billion, five hundred one million, six hundred sixteen thousand, one hundred sixty-one".