165143722 has 4 divisors (see below), whose sum is σ = 247715586. Its totient is φ = 82571860.

The previous prime is 165143681. The next prime is 165143723. The reversal of 165143722 is 227341561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 145950561 + 19193161 = 12081^2 + 4381^2 .

It is not an unprimeable number, because it can be changed into a prime (165143723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41285929 + ... + 41285932.

Almost surely, 2^165143722 is an apocalyptic number.

165143722 is a deficient number, since it is larger than the sum of its proper divisors (82571864).

165143722 is an equidigital number, since it uses as much as digits as its factorization.

165143722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82571863.

The product of its digits is 10080, while the sum is 31.

The square root of 165143722 is about 12850.8257322244. The cubic root of 165143722 is about 548.6398590010.

The spelling of 165143722 in words is "one hundred sixty-five million, one hundred forty-three thousand, seven hundred twenty-two".