161162776777 has 8 divisors (see below), whose sum is σ = 164283677064. Its totient is φ = 158044843008.

The previous prime is 161162776669. The next prime is 161162776787. The reversal of 161162776777 is 777677261161.

It can be written as a sum of positive squares in 4 ways, for example, as 99096521616 + 62066255161 = 314796^2 + 249131^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161162776777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161162776787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631768 + ... + 849385.

It is an arithmetic number, because the mean of its divisors is an integer number (20535459633).

Almost surely, 2^161162776777 is an apocalyptic number.

It is an amenable number.

161162776777 is a deficient number, since it is larger than the sum of its proper divisors (3120900287).

161162776777 is a wasteful number, since it uses less digits than its factorization.

161162776777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483259.

The product of its digits is 7260624, while the sum is 58.

The spelling of 161162776777 in words is "one hundred sixty-one billion, one hundred sixty-two million, seven hundred seventy-six thousand, seven hundred seventy-seven".