161779566177804 has 96 divisors (see below), whose sum is σ = 385462525593600. Its totient is φ = 52798719294720.

The previous prime is 161779566177793. The next prime is 161779566177809. The reversal of 161779566177804 is 408771665977161.

It is not an unprimeable number, because it can be changed into a prime (161779566177809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74831229 + ... + 76962795.

It is an arithmetic number, because the mean of its divisors is an integer number (4015234641600).

Almost surely, 2^{161779566177804} is an apocalyptic number.

It is an amenable number.

161779566177804 is an abundant number, since it is smaller than the sum of its proper divisors (223682959415796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161779566177804 is a wasteful number, since it uses less digits than its factorization.

161779566177804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132263 (or 2132261 counting only the distinct ones).

The product of its (nonzero) digits is 746807040, while the sum is 75.

The spelling of 161779566177804 in words is "one hundred sixty-one trillion, seven hundred seventy-nine billion, five hundred sixty-six million, one hundred seventy-seven thousand, eight hundred four".