161217764 has 24 divisors (see below), whose sum is σ = 296569728. Its totient is φ = 76535360.

The previous prime is 161217761. The next prime is 161217773. The reversal of 161217764 is 467712161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161217761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6209 + ... + 18999.

It is an arithmetic number, because the mean of its divisors is an integer number (12357072).

Almost surely, 2^161217764 is an apocalyptic number.

It is an amenable number.

161217764 is a deficient number, since it is larger than the sum of its proper divisors (135351964).

161217764 is a wasteful number, since it uses less digits than its factorization.

161217764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12955 (or 12953 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 161217764 is about 12697.1557444965. The cubic root of 161217764 is about 544.2573438203.

The spelling of 161217764 in words is "one hundred sixty-one million, two hundred seventeen thousand, seven hundred sixty-four".