161606505501100 has 72 divisors (see below), whose sum is σ = 385579009363968. Its totient is φ = 58303277524800.

The previous prime is 161606505501059. The next prime is 161606505501107. The reversal of 161606505501100 is 1105505606161.

It is a super-2 number, since 2×161606505501100² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161606505501100.

It is not an unprimeable number, because it can be changed into a prime (161606505501107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 578265832 + ... + 578545231.

It is an arithmetic number, because the mean of its divisors is an integer number (5355264018944).

Almost surely, 2^{161606505501100} is an apocalyptic number.

161606505501100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161606505501100 is an abundant number, since it is smaller than the sum of its proper divisors (223972503862868).

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

161606505501100 is a wasteful number, since it uses less digits than its factorization.

161606505501100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156811215 (or 1156811208 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 161606505501100 in words is "one hundred sixty-one trillion, six hundred six billion, five hundred five million, five hundred one thousand, one hundred".