161606110665090 has 64 divisors (see below), whose sum is σ = 477359588434176. Its totient is φ = 34097113458432.

The previous prime is 161606110665079. The next prime is 161606110665091. The reversal of 161606110665090 is 90566011606161.

It is a super-2 number, since 2×161606110665090² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161606110665091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29598186037 + ... + 29598191496.

It is an arithmetic number, because the mean of its divisors is an integer number (7458743569284).

Almost surely, 2^{161606110665090} is an apocalyptic number.

161606110665090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161606110665090 is an abundant number, since it is smaller than the sum of its proper divisors (315753477769086).

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

161606110665090 is a wasteful number, since it uses less digits than its factorization.

161606110665090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59196377563.

The product of its (nonzero) digits is 349920, while the sum is 48.

The spelling of 161606110665090 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred ten million, six hundred sixty-five thousand, ninety".