161606601511506 has 24 divisors (see below), whose sum is σ = 350571031606224. Its totient is φ = 53803729478520.

The previous prime is 161606601511493. The next prime is 161606601511513. The reversal of 161606601511506 is 605115106606161.

161606601511506 is a `hidden beast` number, since 1 + 6 + 1 + 60 + 6 + 60 + 15 + 11 + 506 = 666.

It is a super-2 number, since 2×161606601511506² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5428125700 + ... + 5428155471.

It is an arithmetic number, because the mean of its divisors is an integer number (14607126316926).

Almost surely, 2^{161606601511506} is an apocalyptic number.

161606601511506 is an abundant number, since it is smaller than the sum of its proper divisors (188964430094718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161606601511506 is a wasteful number, since it uses less digits than its factorization.

161606601511506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10856282006 (or 10856282003 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 161606601511506 in words is "one hundred sixty-one trillion, six hundred six billion, six hundred one million, five hundred eleven thousand, five hundred six".