161101665115511 has 4 divisors (see below), whose sum is σ = 161300801908800. Its totient is φ = 160902528322224.

The previous prime is 161101665115439. The next prime is 161101665115561. The reversal of 161101665115511 is 115511566101161.

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 161101665115511 - 2¹⁴ = 161101665099127 is a prime.

It is a super-2 number, since 2×161101665115511² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161101665115561) 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, 99568395431 + ... + 99568397048.

It is an arithmetic number, because the mean of its divisors is an integer number (40325200477200).

Almost surely, 2^{161101665115511} is an apocalyptic number.

161101665115511 is a deficient number, since it is larger than the sum of its proper divisors (199136793289).

161101665115511 is an equidigital number, since it uses as much as digits as its factorization.

161101665115511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199136793288.

The product of its (nonzero) digits is 27000, while the sum is 41.

The spelling of 161101665115511 in words is "one hundred sixty-one trillion, one hundred one billion, six hundred sixty-five million, one hundred fifteen thousand, five hundred eleven".