161601551675051 has 4 divisors (see below), whose sum is σ = 161608072887504. Its totient is φ = 161595030462600.

The previous prime is 161601551675029. The next prime is 161601551675063. The reversal of 161601551675051 is 150576155106161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161601551675051 - 2³⁴ = 161584371805867 is a prime.

It is a super-2 number, since 2×161601551675051² (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 (161601551975051) 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, 3260569055 + ... + 3260618616.

It is an arithmetic number, because the mean of its divisors is an integer number (40402018221876).

Almost surely, 2^{161601551675051} is an apocalyptic number.

161601551675051 is a deficient number, since it is larger than the sum of its proper divisors (6521212453).

161601551675051 is an equidigital number, since it uses as much as digits as its factorization.

161601551675051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6521212452.

The product of its (nonzero) digits is 945000, while the sum is 50.

The spelling of 161601551675051 in words is "one hundred sixty-one trillion, six hundred one billion, five hundred fifty-one million, six hundred seventy-five thousand, fifty-one".