161777882 has 64 divisors (see below), whose sum is σ = 306996480. Its totient is φ = 62361600.

The previous prime is 161777879. The next prime is 161777887. The reversal of 161777882 is 288777161.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (161777887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 575582 + ... + 575862.

It is an arithmetic number, because the mean of its divisors is an integer number (4796820).

Almost surely, 2^161777882 is an apocalyptic number.

161777882 is a deficient number, since it is larger than the sum of its proper divisors (145218598).

161777882 is a wasteful number, since it uses less digits than its factorization.

161777882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407.

The product of its digits is 263424, while the sum is 47.

The square root of 161777882 is about 12719.1934492719. The cubic root of 161777882 is about 544.8869187151.

The spelling of 161777882 in words is "one hundred sixty-one million, seven hundred seventy-seven thousand, eight hundred eighty-two".