161606601511549 has 8 divisors (see below), whose sum is σ = 177508395253440. Its totient is φ = 146444426083296.

The previous prime is 161606601511543. The next prime is 161606601511561. The reversal of 161606601511549 is 945115106606161.

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

It is a cyclic number.

It is not a de Polignac number, because 161606601511549 - 2³ = 161606601511541 is a prime.

It is a super-4 number, since 4×161606601511549⁴ (a number of 58 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 junction number, because it is equal to n+sod(n) for n = 161606601511496 and 161606601511505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606601511541) 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, 184904577952 + ... + 184904578825.

It is an arithmetic number, because the mean of its divisors is an integer number (22188549406680).

Almost surely, 2^{161606601511549} is an apocalyptic number.

161606601511549 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

161606601511549 is a deficient number, since it is larger than the sum of its proper divisors (15901793741891).

161606601511549 is a wasteful number, since it uses less digits than its factorization.

161606601511549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369809156819.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 161606601511549 in words is "one hundred sixty-one trillion, six hundred six billion, six hundred one million, five hundred eleven thousand, five hundred forty-nine".