161779813653 has 8 divisors (see below), whose sum is σ = 215752012128. Its totient is φ = 107830412144.

The previous prime is 161779813583. The next prime is 161779813681. The reversal of 161779813653 is 356318977161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161779813653 - 2⁸ = 161779813397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161779813593 and 161779813602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161779813753) 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 7 ways as a sum of consecutive naturals, for example, 5682675 + ... + 5711072.

It is an arithmetic number, because the mean of its divisors is an integer number (26969001516).

Almost surely, 2^161779813653 is an apocalyptic number.

It is an amenable number.

161779813653 is a deficient number, since it is larger than the sum of its proper divisors (53972198475).

161779813653 is a wasteful number, since it uses less digits than its factorization.

161779813653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11398483.

The product of its digits is 5715360, while the sum is 57.

The spelling of 161779813653 in words is "one hundred sixty-one billion, seven hundred seventy-nine million, eight hundred thirteen thousand, six hundred fifty-three".