161777516 has 24 divisors (see below), whose sum is σ = 285771024. Its totient is φ = 80133120.

The previous prime is 161777509. The next prime is 161777521. The reversal of 161777516 is 615777161.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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 in 7 ways as a sum of consecutive naturals, for example, 272516 + ... + 273108.

It is an arithmetic number, because the mean of its divisors is an integer number (11907126).

Almost surely, 2^161777516 is an apocalyptic number.

It is an amenable number.

161777516 is a deficient number, since it is larger than the sum of its proper divisors (123993508).

161777516 is a wasteful number, since it uses less digits than its factorization.

161777516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121 (or 1119 counting only the distinct ones).

The product of its digits is 61740, while the sum is 41.

The square root of 161777516 is about 12719.1790615590. The cubic root of 161777516 is about 544.8865078045.

The spelling of 161777516 in words is "one hundred sixty-one million, seven hundred seventy-seven thousand, five hundred sixteen".