16161156561011 has 16 divisors (see below), whose sum is σ = 20152617861888. Its totient is φ = 12590831853600.

The previous prime is 16161156560873. The next prime is 16161156561061. The reversal of 16161156561011 is 11016565116161.

It is not a de Polignac number, because 16161156561011 - 2¹⁸ = 16161156298867 is a prime.

It is a super-2 number, since 2×16161156561011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16161156561011.

It is not an unprimeable number, because it can be changed into a prime (16161156561061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18547640 + ... + 19399413.

It is an arithmetic number, because the mean of its divisors is an integer number (1259538616368).

Almost surely, 2^{16161156561011} is an apocalyptic number.

16161156561011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16161156561011 is a deficient number, since it is larger than the sum of its proper divisors (3991461300877).

16161156561011 is a wasteful number, since it uses less digits than its factorization.

16161156561011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37952602.

The product of its (nonzero) digits is 32400, while the sum is 41.

The spelling of 16161156561011 in words is "sixteen trillion, one hundred sixty-one billion, one hundred fifty-six million, five hundred sixty-one thousand, eleven".