161616923077 has 4 divisors (see below), whose sum is σ = 162074761740. Its totient is φ = 161159084416.

The previous prime is 161616923057. The next prime is 161616923087. The reversal of 161616923077 is 770329616161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118120066596 + 43496856481 = 343686^2 + 208559^2 .

It is a cyclic number.

It is not a de Polignac number, because 161616923077 - 2⁷ = 161616922949 is a prime.

It is a super-2 number, since 2×161616923077² (a number of 23 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 161616923077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161616923057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228918802 + ... + 228919507.

It is an arithmetic number, because the mean of its divisors is an integer number (40518690435).

Almost surely, 2^161616923077 is an apocalyptic number.

It is an amenable number.

161616923077 is a deficient number, since it is larger than the sum of its proper divisors (457838663).

161616923077 is an equidigital number, since it uses as much as digits as its factorization.

161616923077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457838662.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 161616923077 in words is "one hundred sixty-one billion, six hundred sixteen million, nine hundred twenty-three thousand, seventy-seven".