161118077226779 has 4 divisors (see below), whose sum is σ = 161229423515184. Its totient is φ = 161006730938376.

The previous prime is 161118077226763. The next prime is 161118077226797. The reversal of 161118077226779 is 977622770811161.

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 161118077226779 - 2⁴ = 161118077226763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161118077226749) 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, 55673142032 + ... + 55673144925.

It is an arithmetic number, because the mean of its divisors is an integer number (40307355878796).

Almost surely, 2^{161118077226779} is an apocalyptic number.

161118077226779 is a deficient number, since it is larger than the sum of its proper divisors (111346288405).

161118077226779 is a wasteful number, since it uses less digits than its factorization.

161118077226779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111346288404.

The product of its (nonzero) digits is 24893568, while the sum is 65.

The spelling of 161118077226779 in words is "one hundred sixty-one trillion, one hundred eighteen billion, seventy-seven million, two hundred twenty-six thousand, seven hundred seventy-nine".