161601015616091 has 8 divisors (see below), whose sum is σ = 162316088488944. Its totient is φ = 160886126558080.

The previous prime is 161601015616069. The next prime is 161601015616111. The reversal of 161601015616091 is 190616510106161.

161601015616091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161601015616091 is a prime.

It is a super-2 number, since 2×161601015616091² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161601015616021) 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, 44191370 + ... + 47708271.

It is an arithmetic number, because the mean of its divisors is an integer number (20289511061118).

Almost surely, 2^{161601015616091} is an apocalyptic number.

161601015616091 is a deficient number, since it is larger than the sum of its proper divisors (715072872853).

161601015616091 is an equidigital number, since it uses as much as digits as its factorization.

161601015616091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91907421.

The product of its (nonzero) digits is 58320, while the sum is 44.

The spelling of 161601015616091 in words is "one hundred sixty-one trillion, six hundred one billion, fifteen million, six hundred sixteen thousand, ninety-one".