165167649 has 6 divisors (see below), whose sum is σ = 238575506. Its totient is φ = 110111760.

The previous prime is 165167633. The next prime is 165167671. The reversal of 165167649 is 946761561.

It can be written as a sum of positive squares in only one way, i.e., 153140625 + 12027024 = 12375^2 + 3468^2 .

It is not a de Polignac number, because 165167649 - 2⁴ = 165167633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165167549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9175972 + ... + 9175989.

Almost surely, 2^165167649 is an apocalyptic number.

It is an amenable number.

165167649 is a deficient number, since it is larger than the sum of its proper divisors (73407857).

165167649 is a wasteful number, since it uses less digits than its factorization.

165167649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18351967 (or 18351964 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 165167649 is about 12851.7566503572. The cubic root of 165167649 is about 548.6663544516. Note that the first 3 decimals are identical.

The spelling of 165167649 in words is "one hundred sixty-five million, one hundred sixty-seven thousand, six hundred forty-nine".