117780506161 has 4 divisors (see below), whose sum is σ = 118338707824. Its totient is φ = 117222304500.

The previous prime is 117780506093. The next prime is 117780506167. The reversal of 117780506161 is 161605087711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 117780506161 - 2¹³ = 117780497969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117780506167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279100515 + ... + 279100936.

It is an arithmetic number, because the mean of its divisors is an integer number (29584676956).

Almost surely, 2^117780506161 is an apocalyptic number.

It is an amenable number.

117780506161 is a deficient number, since it is larger than the sum of its proper divisors (558201663).

117780506161 is an equidigital number, since it uses as much as digits as its factorization.

117780506161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558201662.

The product of its (nonzero) digits is 70560, while the sum is 43.

The spelling of 117780506161 in words is "one hundred seventeen billion, seven hundred eighty million, five hundred six thousand, one hundred sixty-one".