161751764 has 12 divisors (see below), whose sum is σ = 283217844. Its totient is φ = 80832384.

The previous prime is 161751761. The next prime is 161751797. The reversal of 161751764 is 467157161.

It can be written as a sum of positive squares in 2 ways, for example, as 49815364 + 111936400 = 7058^2 + 10580^2 .

It is a super-2 number, since 2×161751764² = 52327266314223392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161751761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637 + ... + 18060.

It is an arithmetic number, because the mean of its divisors is an integer number (23601487).

Almost surely, 2^161751764 is an apocalyptic number.

It is an amenable number.

161751764 is a deficient number, since it is larger than the sum of its proper divisors (121466080).

161751764 is a wasteful number, since it uses less digits than its factorization.

161751764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21754 (or 21752 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 161751764 is about 12718.1666917838. The cubic root of 161751764 is about 544.8575943059.

The spelling of 161751764 in words is "one hundred sixty-one million, seven hundred fifty-one thousand, seven hundred sixty-four".