161065776772 has 6 divisors (see below), whose sum is σ = 281865109358. Its totient is φ = 80532888384.

The previous prime is 161065776763. The next prime is 161065776853. The reversal of 161065776772 is 277677560161.

It can be written as a sum of positive squares in only one way, i.e., 91049441536 + 70016335236 = 301744^2 + 264606^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20133222093 + ... + 20133222100.

Almost surely, 2^161065776772 is an apocalyptic number.

It is an amenable number.

161065776772 is a deficient number, since it is larger than the sum of its proper divisors (120799332586).

161065776772 is a wasteful number, since it uses less digits than its factorization.

161065776772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40266444197 (or 40266444195 counting only the distinct ones).

The product of its (nonzero) digits is 5186160, while the sum is 55.

The spelling of 161065776772 in words is "one hundred sixty-one billion, sixty-five million, seven hundred seventy-six thousand, seven hundred seventy-two".